void
L3GD20::set_driver_lowpass_filter(float samplerate, float bandwidth)
{
_gyro_filter_x.set_cutoff_frequency(samplerate, bandwidth);
_gyro_filter_y.set_cutoff_frequency(samplerate, bandwidth);
_gyro_filter_z.set_cutoff_frequency(samplerate, bandwidth);
}
void
FXAS21002C::set_sw_lowpass_filter(float samplerate, float bandwidth)
{
_gyro_filter_x.set_cutoff_frequency(samplerate, bandwidth);
_gyro_filter_y.set_cutoff_frequency(samplerate, bandwidth);
_gyro_filter_z.set_cutoff_frequency(samplerate, bandwidth);
}
int
LSM303D::accel_set_driver_lowpass_filter(float samplerate, float bandwidth)
{
_accel_filter_x.set_cutoff_frequency(samplerate, bandwidth);
_accel_filter_y.set_cutoff_frequency(samplerate, bandwidth);
_accel_filter_z.set_cutoff_frequency(samplerate, bandwidth);
return OK;
}
void Ekf2::task_main()
{
// subscribe to relevant topics
int sensors_sub = orb_subscribe(ORB_ID(sensor_combined));
int gps_sub = orb_subscribe(ORB_ID(vehicle_gps_position));
int airspeed_sub = orb_subscribe(ORB_ID(airspeed));
int params_sub = orb_subscribe(ORB_ID(parameter_update));
int optical_flow_sub = orb_subscribe(ORB_ID(optical_flow));
int range_finder_sub = orb_subscribe(ORB_ID(distance_sensor));
int ev_pos_sub = orb_subscribe(ORB_ID(vehicle_vision_position));
int ev_att_sub = orb_subscribe(ORB_ID(vehicle_vision_attitude));
int vehicle_land_detected_sub = orb_subscribe(ORB_ID(vehicle_land_detected));
int status_sub = orb_subscribe(ORB_ID(vehicle_status));
px4_pollfd_struct_t fds[2] = {};
fds[0].fd = sensors_sub;
fds[0].events = POLLIN;
fds[1].fd = params_sub;
fds[1].events = POLLIN;
// initialise parameter cache
updateParams();
// initialize data structures outside of loop
// because they will else not always be
// properly populated
sensor_combined_s sensors = {};
vehicle_gps_position_s gps = {};
airspeed_s airspeed = {};
optical_flow_s optical_flow = {};
distance_sensor_s range_finder = {};
vehicle_land_detected_s vehicle_land_detected = {};
vehicle_local_position_s ev_pos = {};
vehicle_attitude_s ev_att = {};
vehicle_status_s vehicle_status = {};
while (!_task_should_exit) {
int ret = px4_poll(fds, sizeof(fds) / sizeof(fds[0]), 1000);
if (ret < 0) {
// Poll error, sleep and try again
usleep(10000);
continue;
} else if (ret == 0) {
// Poll timeout or no new data, do nothing
continue;
}
if (fds[1].revents & POLLIN) {
// read from param to clear updated flag
struct parameter_update_s update;
orb_copy(ORB_ID(parameter_update), params_sub, &update);
updateParams();
// fetch sensor data in next loop
continue;
} else if (!(fds[0].revents & POLLIN)) {
// no new data
continue;
}
bool gps_updated = false;
bool airspeed_updated = false;
bool optical_flow_updated = false;
bool range_finder_updated = false;
bool vehicle_land_detected_updated = false;
bool vision_position_updated = false;
bool vision_attitude_updated = false;
bool vehicle_status_updated = false;
orb_copy(ORB_ID(sensor_combined), sensors_sub, &sensors);
// update all other topics if they have new data
orb_check(status_sub, &vehicle_status_updated);
if (vehicle_status_updated) {
orb_copy(ORB_ID(vehicle_status), status_sub, &vehicle_status);
}
orb_check(gps_sub, &gps_updated);
if (gps_updated) {
orb_copy(ORB_ID(vehicle_gps_position), gps_sub, &gps);
}
orb_check(airspeed_sub, &airspeed_updated);
if (airspeed_updated) {
orb_copy(ORB_ID(airspeed), airspeed_sub, &airspeed);
}
orb_check(optical_flow_sub, &optical_flow_updated);
if (optical_flow_updated) {
orb_copy(ORB_ID(optical_flow), optical_flow_sub, &optical_flow);
}
orb_check(range_finder_sub, &range_finder_updated);
if (range_finder_updated) {
orb_copy(ORB_ID(distance_sensor), range_finder_sub, &range_finder);
if (range_finder.min_distance > range_finder.current_distance
|| range_finder.max_distance < range_finder.current_distance) {
range_finder_updated = false;
}
}
orb_check(ev_pos_sub, &vision_position_updated);
if (vision_position_updated) {
orb_copy(ORB_ID(vehicle_vision_position), ev_pos_sub, &ev_pos);
}
orb_check(ev_att_sub, &vision_attitude_updated);
if (vision_attitude_updated) {
orb_copy(ORB_ID(vehicle_vision_attitude), ev_att_sub, &ev_att);
}
// in replay mode we are getting the actual timestamp from the sensor topic
hrt_abstime now = 0;
if (_replay_mode) {
now = sensors.timestamp;
} else {
now = hrt_absolute_time();
}
// push imu data into estimator
float gyro_integral[3];
gyro_integral[0] = sensors.gyro_rad[0] * sensors.gyro_integral_dt;
gyro_integral[1] = sensors.gyro_rad[1] * sensors.gyro_integral_dt;
gyro_integral[2] = sensors.gyro_rad[2] * sensors.gyro_integral_dt;
float accel_integral[3];
accel_integral[0] = sensors.accelerometer_m_s2[0] * sensors.accelerometer_integral_dt;
accel_integral[1] = sensors.accelerometer_m_s2[1] * sensors.accelerometer_integral_dt;
accel_integral[2] = sensors.accelerometer_m_s2[2] * sensors.accelerometer_integral_dt;
_ekf.setIMUData(now, sensors.gyro_integral_dt * 1.e6f, sensors.accelerometer_integral_dt * 1.e6f,
gyro_integral, accel_integral);
// read mag data
if (sensors.magnetometer_timestamp_relative == sensor_combined_s::RELATIVE_TIMESTAMP_INVALID) {
// set a zero timestamp to let the ekf replay program know that this data is not valid
_timestamp_mag_us = 0;
} else {
if ((sensors.timestamp + sensors.magnetometer_timestamp_relative) != _timestamp_mag_us) {
_timestamp_mag_us = sensors.timestamp + sensors.magnetometer_timestamp_relative;
// If the time last used by the EKF is less than specified, then accumulate the
// data and push the average when the 50msec is reached.
_mag_time_sum_ms += _timestamp_mag_us / 1000;
_mag_sample_count++;
_mag_data_sum[0] += sensors.magnetometer_ga[0];
_mag_data_sum[1] += sensors.magnetometer_ga[1];
_mag_data_sum[2] += sensors.magnetometer_ga[2];
uint32_t mag_time_ms = _mag_time_sum_ms / _mag_sample_count;
if (mag_time_ms - _mag_time_ms_last_used > _params->sensor_interval_min_ms) {
float mag_sample_count_inv = 1.0f / (float)_mag_sample_count;
float mag_data_avg_ga[3] = {_mag_data_sum[0] *mag_sample_count_inv, _mag_data_sum[1] *mag_sample_count_inv, _mag_data_sum[2] *mag_sample_count_inv};
_ekf.setMagData(1000 * (uint64_t)mag_time_ms, mag_data_avg_ga);
_mag_time_ms_last_used = mag_time_ms;
_mag_time_sum_ms = 0;
_mag_sample_count = 0;
_mag_data_sum[0] = 0.0f;
_mag_data_sum[1] = 0.0f;
_mag_data_sum[2] = 0.0f;
}
}
}
// read baro data
if (sensors.baro_timestamp_relative == sensor_combined_s::RELATIVE_TIMESTAMP_INVALID) {
// set a zero timestamp to let the ekf replay program know that this data is not valid
_timestamp_balt_us = 0;
} else {
if ((sensors.timestamp + sensors.baro_timestamp_relative) != _timestamp_balt_us) {
_timestamp_balt_us = sensors.timestamp + sensors.baro_timestamp_relative;
// If the time last used by the EKF is less than specified, then accumulate the
// data and push the average when the 50msec is reached.
_balt_time_sum_ms += _timestamp_balt_us / 1000;
_balt_sample_count++;
_balt_data_sum += sensors.baro_alt_meter;
uint32_t balt_time_ms = _balt_time_sum_ms / _balt_sample_count;
if (balt_time_ms - _balt_time_ms_last_used > (uint32_t)_params->sensor_interval_min_ms) {
float balt_data_avg = _balt_data_sum / (float)_balt_sample_count;
_ekf.setBaroData(1000 * (uint64_t)balt_time_ms, balt_data_avg);
_balt_time_ms_last_used = balt_time_ms;
_balt_time_sum_ms = 0;
_balt_sample_count = 0;
_balt_data_sum = 0.0f;
}
}
}
// read gps data if available
if (gps_updated) {
struct gps_message gps_msg = {};
gps_msg.time_usec = gps.timestamp;
gps_msg.lat = gps.lat;
gps_msg.lon = gps.lon;
gps_msg.alt = gps.alt;
gps_msg.fix_type = gps.fix_type;
gps_msg.eph = gps.eph;
gps_msg.epv = gps.epv;
gps_msg.sacc = gps.s_variance_m_s;
gps_msg.vel_m_s = gps.vel_m_s;
gps_msg.vel_ned[0] = gps.vel_n_m_s;
gps_msg.vel_ned[1] = gps.vel_e_m_s;
gps_msg.vel_ned[2] = gps.vel_d_m_s;
gps_msg.vel_ned_valid = gps.vel_ned_valid;
gps_msg.nsats = gps.satellites_used;
//TODO add gdop to gps topic
gps_msg.gdop = 0.0f;
_ekf.setGpsData(gps.timestamp, &gps_msg);
}
// only set airspeed data if condition for airspeed fusion are met
bool fuse_airspeed = airspeed_updated && !vehicle_status.is_rotary_wing
&& _arspFusionThreshold.get() <= airspeed.true_airspeed_m_s && _arspFusionThreshold.get() >= 0.1f;
if (fuse_airspeed) {
float eas2tas = airspeed.true_airspeed_m_s / airspeed.indicated_airspeed_m_s;
_ekf.setAirspeedData(airspeed.timestamp, airspeed.true_airspeed_m_s, eas2tas);
}
// only fuse synthetic sideslip measurements if conditions are met
bool fuse_beta = !vehicle_status.is_rotary_wing && _fuseBeta.get();
_ekf.set_fuse_beta_flag(fuse_beta);
if (optical_flow_updated) {
flow_message flow;
flow.flowdata(0) = optical_flow.pixel_flow_x_integral;
flow.flowdata(1) = optical_flow.pixel_flow_y_integral;
flow.quality = optical_flow.quality;
flow.gyrodata(0) = optical_flow.gyro_x_rate_integral;
flow.gyrodata(1) = optical_flow.gyro_y_rate_integral;
flow.gyrodata(2) = optical_flow.gyro_z_rate_integral;
flow.dt = optical_flow.integration_timespan;
if (PX4_ISFINITE(optical_flow.pixel_flow_y_integral) &&
PX4_ISFINITE(optical_flow.pixel_flow_x_integral)) {
_ekf.setOpticalFlowData(optical_flow.timestamp, &flow);
}
}
if (range_finder_updated) {
_ekf.setRangeData(range_finder.timestamp, range_finder.current_distance);
}
// get external vision data
// if error estimates are unavailable, use parameter defined defaults
if (vision_position_updated || vision_attitude_updated) {
ext_vision_message ev_data;
ev_data.posNED(0) = ev_pos.x;
ev_data.posNED(1) = ev_pos.y;
ev_data.posNED(2) = ev_pos.z;
Quaternion q(ev_att.q);
ev_data.quat = q;
// position measurement error from parameters. TODO : use covariances from topic
ev_data.posErr = _default_ev_pos_noise;
ev_data.angErr = _default_ev_ang_noise;
// use timestamp from external computer, clocks are synchronized when using MAVROS
_ekf.setExtVisionData(vision_position_updated ? ev_pos.timestamp : ev_att.timestamp, &ev_data);
}
orb_check(vehicle_land_detected_sub, &vehicle_land_detected_updated);
if (vehicle_land_detected_updated) {
orb_copy(ORB_ID(vehicle_land_detected), vehicle_land_detected_sub, &vehicle_land_detected);
_ekf.set_in_air_status(!vehicle_land_detected.landed);
}
// run the EKF update and output
if (_ekf.update()) {
matrix::Quaternion<float> q;
_ekf.copy_quaternion(q.data());
float velocity[3];
_ekf.get_velocity(velocity);
float gyro_rad[3];
{
// generate control state data
control_state_s ctrl_state = {};
float gyro_bias[3] = {};
_ekf.get_gyro_bias(gyro_bias);
ctrl_state.timestamp = _replay_mode ? now : hrt_absolute_time();
gyro_rad[0] = sensors.gyro_rad[0] - gyro_bias[0];
gyro_rad[1] = sensors.gyro_rad[1] - gyro_bias[1];
gyro_rad[2] = sensors.gyro_rad[2] - gyro_bias[2];
ctrl_state.roll_rate = _lp_roll_rate.apply(gyro_rad[0]);
ctrl_state.pitch_rate = _lp_pitch_rate.apply(gyro_rad[1]);
ctrl_state.yaw_rate = _lp_yaw_rate.apply(gyro_rad[2]);
ctrl_state.roll_rate_bias = gyro_bias[0];
ctrl_state.pitch_rate_bias = gyro_bias[1];
ctrl_state.yaw_rate_bias = gyro_bias[2];
// Velocity in body frame
Vector3f v_n(velocity);
matrix::Dcm<float> R_to_body(q.inversed());
Vector3f v_b = R_to_body * v_n;
ctrl_state.x_vel = v_b(0);
ctrl_state.y_vel = v_b(1);
ctrl_state.z_vel = v_b(2);
// Local Position NED
float position[3];
_ekf.get_position(position);
ctrl_state.x_pos = position[0];
ctrl_state.y_pos = position[1];
ctrl_state.z_pos = position[2];
// Attitude quaternion
q.copyTo(ctrl_state.q);
_ekf.get_quat_reset(&ctrl_state.delta_q_reset[0], &ctrl_state.quat_reset_counter);
// Acceleration data
matrix::Vector<float, 3> acceleration(sensors.accelerometer_m_s2);
float accel_bias[3];
_ekf.get_accel_bias(accel_bias);
ctrl_state.x_acc = acceleration(0) - accel_bias[0];
ctrl_state.y_acc = acceleration(1) - accel_bias[1];
ctrl_state.z_acc = acceleration(2) - accel_bias[2];
// compute lowpass filtered horizontal acceleration
acceleration = R_to_body.transpose() * acceleration;
_acc_hor_filt = 0.95f * _acc_hor_filt + 0.05f * sqrtf(acceleration(0) * acceleration(0) +
acceleration(1) * acceleration(1));
ctrl_state.horz_acc_mag = _acc_hor_filt;
ctrl_state.airspeed_valid = false;
// use estimated velocity for airspeed estimate
if (_airspeed_mode.get() == control_state_s::AIRSPD_MODE_MEAS) {
// use measured airspeed
if (PX4_ISFINITE(airspeed.indicated_airspeed_m_s) && hrt_absolute_time() - airspeed.timestamp < 1e6
&& airspeed.timestamp > 0) {
ctrl_state.airspeed = airspeed.indicated_airspeed_m_s;
ctrl_state.airspeed_valid = true;
}
} else if (_airspeed_mode.get() == control_state_s::AIRSPD_MODE_EST) {
if (_ekf.local_position_is_valid()) {
ctrl_state.airspeed = sqrtf(velocity[0] * velocity[0] + velocity[1] * velocity[1] + velocity[2] * velocity[2]);
ctrl_state.airspeed_valid = true;
}
} else if (_airspeed_mode.get() == control_state_s::AIRSPD_MODE_DISABLED) {
// do nothing, airspeed has been declared as non-valid above, controllers
// will handle this assuming always trim airspeed
}
// publish control state data
if (_control_state_pub == nullptr) {
_control_state_pub = orb_advertise(ORB_ID(control_state), &ctrl_state);
} else {
orb_publish(ORB_ID(control_state), _control_state_pub, &ctrl_state);
}
}
{
// generate vehicle attitude quaternion data
struct vehicle_attitude_s att = {};
att.timestamp = _replay_mode ? now : hrt_absolute_time();
q.copyTo(att.q);
att.rollspeed = gyro_rad[0];
att.pitchspeed = gyro_rad[1];
att.yawspeed = gyro_rad[2];
// publish vehicle attitude data
if (_att_pub == nullptr) {
_att_pub = orb_advertise(ORB_ID(vehicle_attitude), &att);
} else {
orb_publish(ORB_ID(vehicle_attitude), _att_pub, &att);
}
}
// generate vehicle local position data
struct vehicle_local_position_s lpos = {};
float pos[3] = {};
lpos.timestamp = _replay_mode ? now : hrt_absolute_time();
// Position of body origin in local NED frame
_ekf.get_position(pos);
lpos.x = (_ekf.local_position_is_valid()) ? pos[0] : 0.0f;
lpos.y = (_ekf.local_position_is_valid()) ? pos[1] : 0.0f;
lpos.z = pos[2];
// Velocity of body origin in local NED frame (m/s)
lpos.vx = velocity[0];
lpos.vy = velocity[1];
lpos.vz = velocity[2];
// TODO: better status reporting
lpos.xy_valid = _ekf.local_position_is_valid();
lpos.z_valid = true;
lpos.v_xy_valid = _ekf.local_position_is_valid();
lpos.v_z_valid = true;
// Position of local NED origin in GPS / WGS84 frame
struct map_projection_reference_s ekf_origin = {};
// true if position (x, y) is valid and has valid global reference (ref_lat, ref_lon)
_ekf.get_ekf_origin(&lpos.ref_timestamp, &ekf_origin, &lpos.ref_alt);
lpos.xy_global = _ekf.global_position_is_valid();
lpos.z_global = true; // true if z is valid and has valid global reference (ref_alt)
lpos.ref_lat = ekf_origin.lat_rad * 180.0 / M_PI; // Reference point latitude in degrees
lpos.ref_lon = ekf_origin.lon_rad * 180.0 / M_PI; // Reference point longitude in degrees
// The rotation of the tangent plane vs. geographical north
matrix::Eulerf euler(q);
lpos.yaw = euler.psi();
float terrain_vpos;
lpos.dist_bottom_valid = _ekf.get_terrain_vert_pos(&terrain_vpos);
lpos.dist_bottom = terrain_vpos - pos[2]; // Distance to bottom surface (ground) in meters
lpos.dist_bottom_rate = -velocity[2]; // Distance to bottom surface (ground) change rate
lpos.surface_bottom_timestamp = hrt_absolute_time(); // Time when new bottom surface found
// TODO: uORB definition does not define what these variables are. We have assumed them to be horizontal and vertical 1-std dev accuracy in metres
Vector3f pos_var, vel_var;
_ekf.get_pos_var(pos_var);
_ekf.get_vel_var(vel_var);
lpos.eph = sqrtf(pos_var(0) + pos_var(1));
lpos.epv = sqrtf(pos_var(2));
// get state reset information of position and velocity
_ekf.get_posD_reset(&lpos.delta_z, &lpos.z_reset_counter);
_ekf.get_velD_reset(&lpos.delta_vz, &lpos.vz_reset_counter);
_ekf.get_posNE_reset(&lpos.delta_xy[0], &lpos.xy_reset_counter);
_ekf.get_velNE_reset(&lpos.delta_vxy[0], &lpos.vxy_reset_counter);
// publish vehicle local position data
if (_lpos_pub == nullptr) {
_lpos_pub = orb_advertise(ORB_ID(vehicle_local_position), &lpos);
} else {
orb_publish(ORB_ID(vehicle_local_position), _lpos_pub, &lpos);
}
if (_ekf.global_position_is_valid()) {
// generate and publish global position data
struct vehicle_global_position_s global_pos = {};
global_pos.timestamp = _replay_mode ? now : hrt_absolute_time();
global_pos.time_utc_usec = gps.time_utc_usec; // GPS UTC timestamp in microseconds
double est_lat, est_lon, lat_pre_reset, lon_pre_reset;
map_projection_reproject(&ekf_origin, lpos.x, lpos.y, &est_lat, &est_lon);
global_pos.lat = est_lat; // Latitude in degrees
global_pos.lon = est_lon; // Longitude in degrees
map_projection_reproject(&ekf_origin, lpos.x - lpos.delta_xy[0], lpos.y - lpos.delta_xy[1], &lat_pre_reset,
&lon_pre_reset);
global_pos.delta_lat_lon[0] = est_lat - lat_pre_reset;
global_pos.delta_lat_lon[1] = est_lon - lon_pre_reset;
global_pos.lat_lon_reset_counter = lpos.xy_reset_counter;
global_pos.alt = -pos[2] + lpos.ref_alt; // Altitude AMSL in meters
_ekf.get_posD_reset(&global_pos.delta_alt, &global_pos.alt_reset_counter);
// global altitude has opposite sign of local down position
global_pos.delta_alt *= -1.0f;
global_pos.vel_n = velocity[0]; // Ground north velocity, m/s
global_pos.vel_e = velocity[1]; // Ground east velocity, m/s
global_pos.vel_d = velocity[2]; // Ground downside velocity, m/s
global_pos.yaw = euler.psi(); // Yaw in radians -PI..+PI.
global_pos.eph = sqrtf(pos_var(0) + pos_var(1));; // Standard deviation of position estimate horizontally
global_pos.epv = sqrtf(pos_var(2)); // Standard deviation of position vertically
if (lpos.dist_bottom_valid) {
global_pos.terrain_alt = lpos.ref_alt - terrain_vpos; // Terrain altitude in m, WGS84
global_pos.terrain_alt_valid = true; // Terrain altitude estimate is valid
} else {
global_pos.terrain_alt = 0.0f; // Terrain altitude in m, WGS84
global_pos.terrain_alt_valid = false; // Terrain altitude estimate is valid
}
// TODO use innovatun consistency check timouts to set this
global_pos.dead_reckoning = false; // True if this position is estimated through dead-reckoning
global_pos.pressure_alt = sensors.baro_alt_meter; // Pressure altitude AMSL (m)
if (_vehicle_global_position_pub == nullptr) {
_vehicle_global_position_pub = orb_advertise(ORB_ID(vehicle_global_position), &global_pos);
} else {
orb_publish(ORB_ID(vehicle_global_position), _vehicle_global_position_pub, &global_pos);
}
}
} else if (_replay_mode) {
// in replay mode we have to tell the replay module not to wait for an update
// we do this by publishing an attitude with zero timestamp
struct vehicle_attitude_s att = {};
att.timestamp = now;
if (_att_pub == nullptr) {
_att_pub = orb_advertise(ORB_ID(vehicle_attitude), &att);
} else {
orb_publish(ORB_ID(vehicle_attitude), _att_pub, &att);
}
}
// publish estimator status
struct estimator_status_s status = {};
status.timestamp = _replay_mode ? now : hrt_absolute_time();
_ekf.get_state_delayed(status.states);
_ekf.get_covariances(status.covariances);
_ekf.get_gps_check_status(&status.gps_check_fail_flags);
_ekf.get_control_mode(&status.control_mode_flags);
_ekf.get_filter_fault_status(&status.filter_fault_flags);
_ekf.get_innovation_test_status(&status.innovation_check_flags, &status.mag_test_ratio,
&status.vel_test_ratio, &status.pos_test_ratio,
&status.hgt_test_ratio, &status.tas_test_ratio,
&status.hagl_test_ratio);
bool dead_reckoning;
_ekf.get_ekf_lpos_accuracy(&status.pos_horiz_accuracy, &status.pos_vert_accuracy, &dead_reckoning);
_ekf.get_ekf_soln_status(&status.solution_status_flags);
_ekf.get_imu_vibe_metrics(status.vibe);
if (_estimator_status_pub == nullptr) {
_estimator_status_pub = orb_advertise(ORB_ID(estimator_status), &status);
} else {
orb_publish(ORB_ID(estimator_status), _estimator_status_pub, &status);
}
// Publish wind estimate
struct wind_estimate_s wind_estimate = {};
wind_estimate.timestamp = _replay_mode ? now : hrt_absolute_time();
wind_estimate.windspeed_north = status.states[22];
wind_estimate.windspeed_east = status.states[23];
wind_estimate.covariance_north = status.covariances[22];
wind_estimate.covariance_east = status.covariances[23];
if (_wind_pub == nullptr) {
_wind_pub = orb_advertise(ORB_ID(wind_estimate), &wind_estimate);
} else {
orb_publish(ORB_ID(wind_estimate), _wind_pub, &wind_estimate);
}
// publish estimator innovation data
{
struct ekf2_innovations_s innovations = {};
innovations.timestamp = _replay_mode ? now : hrt_absolute_time();
_ekf.get_vel_pos_innov(&innovations.vel_pos_innov[0]);
_ekf.get_mag_innov(&innovations.mag_innov[0]);
_ekf.get_heading_innov(&innovations.heading_innov);
_ekf.get_airspeed_innov(&innovations.airspeed_innov);
_ekf.get_beta_innov(&innovations.beta_innov);
_ekf.get_flow_innov(&innovations.flow_innov[0]);
_ekf.get_hagl_innov(&innovations.hagl_innov);
_ekf.get_vel_pos_innov_var(&innovations.vel_pos_innov_var[0]);
_ekf.get_mag_innov_var(&innovations.mag_innov_var[0]);
_ekf.get_heading_innov_var(&innovations.heading_innov_var);
_ekf.get_airspeed_innov_var(&innovations.airspeed_innov_var);
_ekf.get_beta_innov_var(&innovations.beta_innov_var);
_ekf.get_flow_innov_var(&innovations.flow_innov_var[0]);
_ekf.get_hagl_innov_var(&innovations.hagl_innov_var);
_ekf.get_output_tracking_error(&innovations.output_tracking_error[0]);
if (_estimator_innovations_pub == nullptr) {
_estimator_innovations_pub = orb_advertise(ORB_ID(ekf2_innovations), &innovations);
} else {
orb_publish(ORB_ID(ekf2_innovations), _estimator_innovations_pub, &innovations);
}
}
// save the declination to the EKF2_MAG_DECL parameter when a land event is detected
if ((_params->mag_declination_source & (1 << 1)) && !_prev_landed && vehicle_land_detected.landed) {
float decl_deg;
_ekf.copy_mag_decl_deg(&decl_deg);
_mag_declination_deg.set(decl_deg);
}
_prev_landed = vehicle_land_detected.landed;
// publish ekf2_timestamps (using 0.1 ms relative timestamps)
{
ekf2_timestamps_s ekf2_timestamps;
ekf2_timestamps.timestamp = sensors.timestamp;
if (gps_updated) {
// divide individually to get consistent rounding behavior
ekf2_timestamps.gps_timestamp_rel = (int16_t)((int64_t)gps.timestamp / 100 - (int64_t)ekf2_timestamps.timestamp / 100);
} else {
ekf2_timestamps.gps_timestamp_rel = ekf2_timestamps_s::RELATIVE_TIMESTAMP_INVALID;
}
if (optical_flow_updated) {
ekf2_timestamps.optical_flow_timestamp_rel = (int16_t)((int64_t)optical_flow.timestamp / 100 -
(int64_t)ekf2_timestamps.timestamp / 100);
} else {
ekf2_timestamps.optical_flow_timestamp_rel = ekf2_timestamps_s::RELATIVE_TIMESTAMP_INVALID;
}
if (range_finder_updated) {
ekf2_timestamps.distance_sensor_timestamp_rel = (int16_t)((int64_t)range_finder.timestamp / 100 -
(int64_t)ekf2_timestamps.timestamp / 100);
} else {
ekf2_timestamps.distance_sensor_timestamp_rel = ekf2_timestamps_s::RELATIVE_TIMESTAMP_INVALID;
}
if (airspeed_updated) {
ekf2_timestamps.airspeed_timestamp_rel = (int16_t)((int64_t)airspeed.timestamp / 100 -
(int64_t)ekf2_timestamps.timestamp / 100);
} else {
ekf2_timestamps.airspeed_timestamp_rel = ekf2_timestamps_s::RELATIVE_TIMESTAMP_INVALID;
}
if (vision_position_updated) {
ekf2_timestamps.vision_position_timestamp_rel = (int16_t)((int64_t)ev_pos.timestamp / 100 -
(int64_t)ekf2_timestamps.timestamp / 100);
} else {
ekf2_timestamps.vision_position_timestamp_rel = ekf2_timestamps_s::RELATIVE_TIMESTAMP_INVALID;
}
if (vision_attitude_updated) {
ekf2_timestamps.vision_attitude_timestamp_rel = (int16_t)((int64_t)ev_att.timestamp / 100 -
(int64_t)ekf2_timestamps.timestamp / 100);
} else {
ekf2_timestamps.vision_attitude_timestamp_rel = ekf2_timestamps_s::RELATIVE_TIMESTAMP_INVALID;
}
if (_ekf2_timestamps_pub == nullptr) {
_ekf2_timestamps_pub = orb_advertise(ORB_ID(ekf2_timestamps), &ekf2_timestamps);
} else {
orb_publish(ORB_ID(ekf2_timestamps), _ekf2_timestamps_pub, &ekf2_timestamps);
}
}
// publish replay message if in replay mode
bool publish_replay_message = (bool)_param_record_replay_msg.get();
if (publish_replay_message) {
struct ekf2_replay_s replay = {};
replay.timestamp = now;
replay.gyro_integral_dt = sensors.gyro_integral_dt;
replay.accelerometer_integral_dt = sensors.accelerometer_integral_dt;
replay.magnetometer_timestamp = _timestamp_mag_us;
replay.baro_timestamp = _timestamp_balt_us;
memcpy(replay.gyro_rad, sensors.gyro_rad, sizeof(replay.gyro_rad));
memcpy(replay.accelerometer_m_s2, sensors.accelerometer_m_s2, sizeof(replay.accelerometer_m_s2));
memcpy(replay.magnetometer_ga, sensors.magnetometer_ga, sizeof(replay.magnetometer_ga));
replay.baro_alt_meter = sensors.baro_alt_meter;
// only write gps data if we had a gps update.
if (gps_updated) {
replay.time_usec = gps.timestamp;
replay.lat = gps.lat;
replay.lon = gps.lon;
replay.alt = gps.alt;
replay.fix_type = gps.fix_type;
replay.nsats = gps.satellites_used;
replay.eph = gps.eph;
replay.epv = gps.epv;
replay.sacc = gps.s_variance_m_s;
replay.vel_m_s = gps.vel_m_s;
replay.vel_n_m_s = gps.vel_n_m_s;
replay.vel_e_m_s = gps.vel_e_m_s;
replay.vel_d_m_s = gps.vel_d_m_s;
replay.vel_ned_valid = gps.vel_ned_valid;
} else {
// this will tell the logging app not to bother logging any gps replay data
replay.time_usec = 0;
}
if (optical_flow_updated) {
replay.flow_timestamp = optical_flow.timestamp;
replay.flow_pixel_integral[0] = optical_flow.pixel_flow_x_integral;
replay.flow_pixel_integral[1] = optical_flow.pixel_flow_y_integral;
replay.flow_gyro_integral[0] = optical_flow.gyro_x_rate_integral;
replay.flow_gyro_integral[1] = optical_flow.gyro_y_rate_integral;
replay.flow_time_integral = optical_flow.integration_timespan;
replay.flow_quality = optical_flow.quality;
} else {
replay.flow_timestamp = 0;
}
if (range_finder_updated) {
replay.rng_timestamp = range_finder.timestamp;
replay.range_to_ground = range_finder.current_distance;
} else {
replay.rng_timestamp = 0;
}
if (airspeed_updated) {
replay.asp_timestamp = airspeed.timestamp;
replay.indicated_airspeed_m_s = airspeed.indicated_airspeed_m_s;
replay.true_airspeed_m_s = airspeed.true_airspeed_m_s;
} else {
replay.asp_timestamp = 0;
}
if (vision_position_updated || vision_attitude_updated) {
replay.ev_timestamp = vision_position_updated ? ev_pos.timestamp : ev_att.timestamp;
replay.pos_ev[0] = ev_pos.x;
replay.pos_ev[1] = ev_pos.y;
replay.pos_ev[2] = ev_pos.z;
replay.quat_ev[0] = ev_att.q[0];
replay.quat_ev[1] = ev_att.q[1];
replay.quat_ev[2] = ev_att.q[2];
replay.quat_ev[3] = ev_att.q[3];
// TODO : switch to covariances from topic later
replay.pos_err = _default_ev_pos_noise;
replay.ang_err = _default_ev_ang_noise;
} else {
replay.ev_timestamp = 0;
}
if (_replay_pub == nullptr) {
_replay_pub = orb_advertise(ORB_ID(ekf2_replay), &replay);
} else {
orb_publish(ORB_ID(ekf2_replay), _replay_pub, &replay);
}
}
}
orb_unsubscribe(sensors_sub);
orb_unsubscribe(gps_sub);
orb_unsubscribe(airspeed_sub);
orb_unsubscribe(params_sub);
orb_unsubscribe(optical_flow_sub);
orb_unsubscribe(range_finder_sub);
orb_unsubscribe(ev_pos_sub);
orb_unsubscribe(vehicle_land_detected_sub);
orb_unsubscribe(status_sub);
delete ekf2::instance;
ekf2::instance = nullptr;
}
int
LSM303D::ioctl(struct file *filp, int cmd, unsigned long arg)
{
switch (cmd) {
case SENSORIOCSPOLLRATE: {
switch (arg) {
/* switching to manual polling */
case SENSOR_POLLRATE_MANUAL:
stop();
_call_accel_interval = 0;
return OK;
/* external signalling not supported */
case SENSOR_POLLRATE_EXTERNAL:
/* zero would be bad */
case 0:
return -EINVAL;
/* set default/max polling rate */
case SENSOR_POLLRATE_MAX:
return ioctl(filp, SENSORIOCSPOLLRATE, 1600);
case SENSOR_POLLRATE_DEFAULT:
return ioctl(filp, SENSORIOCSPOLLRATE, LSM303D_ACCEL_DEFAULT_RATE);
/* adjust to a legal polling interval in Hz */
default: {
/* do we need to start internal polling? */
bool want_start = (_call_accel_interval == 0);
/* convert hz to hrt interval via microseconds */
unsigned ticks = 1000000 / arg;
/* check against maximum sane rate */
if (ticks < 500)
return -EINVAL;
/* adjust filters */
accel_set_driver_lowpass_filter((float)arg, _accel_filter_x.get_cutoff_freq());
/* update interval for next measurement */
/* XXX this is a bit shady, but no other way to adjust... */
_accel_call.period = _call_accel_interval = ticks;
/* if we need to start the poll state machine, do it */
if (want_start)
start();
return OK;
}
}
}
case SENSORIOCGPOLLRATE:
if (_call_accel_interval == 0)
return SENSOR_POLLRATE_MANUAL;
return 1000000 / _call_accel_interval;
case SENSORIOCSQUEUEDEPTH: {
/* lower bound is mandatory, upper bound is a sanity check */
if ((arg < 1) || (arg > 100))
return -EINVAL;
irqstate_t flags = irqsave();
if (!_accel_reports->resize(arg)) {
irqrestore(flags);
return -ENOMEM;
}
irqrestore(flags);
return OK;
}
case SENSORIOCGQUEUEDEPTH:
return _accel_reports->size();
case SENSORIOCRESET:
reset();
return OK;
case ACCELIOCSSAMPLERATE:
return accel_set_samplerate(arg);
case ACCELIOCGSAMPLERATE:
return _accel_samplerate;
case ACCELIOCSLOWPASS: {
return accel_set_driver_lowpass_filter((float)_accel_samplerate, (float)arg);
}
case ACCELIOCGLOWPASS:
return _accel_filter_x.get_cutoff_freq();
case ACCELIOCSSCALE: {
/* copy scale, but only if off by a few percent */
struct accel_scale *s = (struct accel_scale *) arg;
float sum = s->x_scale + s->y_scale + s->z_scale;
if (sum > 2.0f && sum < 4.0f) {
memcpy(&_accel_scale, s, sizeof(_accel_scale));
return OK;
} else {
return -EINVAL;
}
}
case ACCELIOCSRANGE:
/* arg needs to be in G */
return accel_set_range(arg);
case ACCELIOCGRANGE:
/* convert to m/s^2 and return rounded in G */
return (unsigned long)((_accel_range_m_s2)/LSM303D_ONE_G + 0.5f);
case ACCELIOCGSCALE:
/* copy scale out */
memcpy((struct accel_scale *) arg, &_accel_scale, sizeof(_accel_scale));
return OK;
case ACCELIOCSELFTEST:
return accel_self_test();
default:
/* give it to the superclass */
return SPI::ioctl(filp, cmd, arg);
}
}
void
LSM303D::measure()
{
/* status register and data as read back from the device */
#pragma pack(push, 1)
struct {
uint8_t cmd;
uint8_t status;
int16_t x;
int16_t y;
int16_t z;
} raw_accel_report;
#pragma pack(pop)
accel_report accel_report;
/* start the performance counter */
perf_begin(_accel_sample_perf);
/* fetch data from the sensor */
raw_accel_report.cmd = ADDR_STATUS_A | DIR_READ | ADDR_INCREMENT;
transfer((uint8_t *)&raw_accel_report, (uint8_t *)&raw_accel_report, sizeof(raw_accel_report));
/*
* 1) Scale raw value to SI units using scaling from datasheet.
* 2) Subtract static offset (in SI units)
* 3) Scale the statically calibrated values with a linear
* dynamically obtained factor
*
* Note: the static sensor offset is the number the sensor outputs
* at a nominally 'zero' input. Therefore the offset has to
* be subtracted.
*
* Example: A gyro outputs a value of 74 at zero angular rate
* the offset is 74 from the origin and subtracting
* 74 from all measurements centers them around zero.
*/
accel_report.timestamp = hrt_absolute_time();
accel_report.x_raw = raw_accel_report.x;
accel_report.y_raw = raw_accel_report.y;
accel_report.z_raw = raw_accel_report.z;
float x_in_new = ((accel_report.x_raw * _accel_range_scale) - _accel_scale.x_offset) * _accel_scale.x_scale;
float y_in_new = ((accel_report.y_raw * _accel_range_scale) - _accel_scale.y_offset) * _accel_scale.y_scale;
float z_in_new = ((accel_report.z_raw * _accel_range_scale) - _accel_scale.z_offset) * _accel_scale.z_scale;
accel_report.x = _accel_filter_x.apply(x_in_new);
accel_report.y = _accel_filter_y.apply(y_in_new);
accel_report.z = _accel_filter_z.apply(z_in_new);
accel_report.scaling = _accel_range_scale;
accel_report.range_m_s2 = _accel_range_m_s2;
_accel_reports->force(&accel_report);
/* notify anyone waiting for data */
poll_notify(POLLIN);
/* publish for subscribers */
orb_publish(ORB_ID(sensor_accel), _accel_topic, &accel_report);
_accel_read++;
/* stop the perf counter */
perf_end(_accel_sample_perf);
}
int
FXAS21002C::ioctl(struct file *filp, int cmd, unsigned long arg)
{
switch (cmd) {
case SENSORIOCSPOLLRATE: {
switch (arg) {
/* zero would be bad */
case 0:
return -EINVAL;
/* set default polling rate */
case SENSOR_POLLRATE_DEFAULT:
return ioctl(filp, SENSORIOCSPOLLRATE, FXAS21002C_DEFAULT_RATE);
/* adjust to a legal polling interval in Hz */
default: {
/* do we need to start internal polling? */
bool want_start = (_call_interval == 0);
/* convert hz to hrt interval via microseconds */
unsigned ticks = 1000000 / arg;
/* check against maximum sane rate */
if (ticks < 1000) {
return -EINVAL;
}
/* update interval for next measurement */
/* XXX this is a bit shady, but no other way to adjust... */
_call_interval = ticks;
_gyro_call.period = _call_interval - FXAS21002C_TIMER_REDUCTION;
/* adjust filters */
float cutoff_freq_hz = _gyro_filter_x.get_cutoff_freq();
float sample_rate = 1.0e6f / ticks;
set_sw_lowpass_filter(sample_rate, cutoff_freq_hz);
/* if we need to start the poll state machine, do it */
if (want_start) {
start();
}
return OK;
}
}
}
case SENSORIOCRESET:
reset();
return OK;
case GYROIOCSSCALE:
/* copy scale in */
memcpy(&_gyro_scale, (struct gyro_calibration_s *) arg, sizeof(_gyro_scale));
return OK;
default:
/* give it to the superclass */
return SPI::ioctl(filp, cmd, arg);
}
}
int
MEASAirspeedSim::collect()
{
int ret = -EIO;
/* read from the sensor */
#pragma pack(push, 1)
struct {
float temperature;
float diff_pressure;
} airspeed_report;
#pragma pack(pop)
perf_begin(_sample_perf);
ret = transfer(nullptr, 0, (uint8_t *)&airspeed_report, sizeof(airspeed_report));
if (ret < 0) {
perf_count(_comms_errors);
perf_end(_sample_perf);
return ret;
}
uint8_t status = 0;
switch (status) {
case 0:
break;
case 1:
/* fallthrough */
case 2:
/* fallthrough */
case 3:
perf_count(_comms_errors);
perf_end(_sample_perf);
return -EAGAIN;
}
float temperature = airspeed_report.temperature;
float diff_press_pa_raw = airspeed_report.diff_pressure * 100.0f; // convert from millibar to bar
struct differential_pressure_s report;
/* track maximum differential pressure measured (so we can work out top speed). */
if (diff_press_pa_raw > _max_differential_pressure_pa) {
_max_differential_pressure_pa = diff_press_pa_raw;
}
report.timestamp = hrt_absolute_time();
report.error_count = perf_event_count(_comms_errors);
report.temperature = temperature;
report.differential_pressure_filtered_pa = _filter.apply(diff_press_pa_raw);
report.differential_pressure_raw_pa = diff_press_pa_raw;
report.max_differential_pressure_pa = _max_differential_pressure_pa;
if (_airspeed_pub != nullptr && !(_pub_blocked)) {
/* publish it */
orb_publish(ORB_ID(differential_pressure), _airspeed_pub, &report);
}
new_report(report);
/* notify anyone waiting for data */
poll_notify(POLLIN);
ret = OK;
perf_end(_sample_perf);
return ret;
}
int DfMpu9250Wrapper::_publish(struct imu_sensor_data &data)
{
/* Check if calibration values are still up-to-date. */
bool updated;
orb_check(_param_update_sub, &updated);
if (updated) {
parameter_update_s parameter_update;
orb_copy(ORB_ID(parameter_update), _param_update_sub, ¶meter_update);
_update_accel_calibration();
_update_gyro_calibration();
_update_mag_calibration();
}
accel_report accel_report = {};
gyro_report gyro_report = {};
mag_report mag_report = {};
accel_report.timestamp = gyro_report.timestamp = hrt_absolute_time();
// ACCEL
float xraw_f = data.accel_m_s2_x;
float yraw_f = data.accel_m_s2_y;
float zraw_f = data.accel_m_s2_z;
// apply user specified rotation
rotate_3f(_rotation, xraw_f, yraw_f, zraw_f);
// MPU9250 driver from DriverFramework does not provide any raw values
// TEMP We misuse the raw values on the Snapdragon to publish unfiltered data for VISLAM
accel_report.x_raw = (int16_t)(xraw_f * 1000); // (int16) [m / s^2 * 1000];
accel_report.y_raw = (int16_t)(yraw_f * 1000); // (int16) [m / s^2 * 1000];
accel_report.z_raw = (int16_t)(zraw_f * 1000); // (int16) [m / s^2 * 1000];
// adjust values according to the calibration
float x_in_new = (xraw_f - _accel_calibration.x_offset) * _accel_calibration.x_scale;
float y_in_new = (yraw_f - _accel_calibration.y_offset) * _accel_calibration.y_scale;
float z_in_new = (zraw_f - _accel_calibration.z_offset) * _accel_calibration.z_scale;
accel_report.x = _accel_filter_x.apply(x_in_new);
accel_report.y = _accel_filter_y.apply(y_in_new);
accel_report.z = _accel_filter_z.apply(z_in_new);
matrix::Vector3f aval(x_in_new, y_in_new, z_in_new);
matrix::Vector3f aval_integrated;
_accel_int.put(accel_report.timestamp, aval, aval_integrated, accel_report.integral_dt);
accel_report.x_integral = aval_integrated(0);
accel_report.y_integral = aval_integrated(1);
accel_report.z_integral = aval_integrated(2);
// GYRO
xraw_f = data.gyro_rad_s_x;
yraw_f = data.gyro_rad_s_y;
zraw_f = data.gyro_rad_s_z;
// apply user specified rotation
rotate_3f(_rotation, xraw_f, yraw_f, zraw_f);
// MPU9250 driver from DriverFramework does not provide any raw values
// TEMP We misuse the raw values on the Snapdragon to publish unfiltered data for VISLAM
gyro_report.x_raw = (int16_t)(xraw_f * 1000); // (int16) [rad / s * 1000];
gyro_report.y_raw = (int16_t)(yraw_f * 1000); // (int16) [rad / s * 1000];
gyro_report.z_raw = (int16_t)(zraw_f * 1000); // (int16) [rad / s * 1000];
// adjust values according to the calibration
float x_gyro_in_new = (xraw_f - _gyro_calibration.x_offset) * _gyro_calibration.x_scale;
float y_gyro_in_new = (yraw_f - _gyro_calibration.y_offset) * _gyro_calibration.y_scale;
float z_gyro_in_new = (zraw_f - _gyro_calibration.z_offset) * _gyro_calibration.z_scale;
gyro_report.x = _gyro_filter_x.apply(x_gyro_in_new);
gyro_report.y = _gyro_filter_y.apply(y_gyro_in_new);
gyro_report.z = _gyro_filter_z.apply(z_gyro_in_new);
matrix::Vector3f gval(x_gyro_in_new, y_gyro_in_new, z_gyro_in_new);
matrix::Vector3f gval_integrated;
_gyro_int.put(gyro_report.timestamp, gval, gval_integrated, gyro_report.integral_dt);
gyro_report.x_integral = gval_integrated(0);
gyro_report.y_integral = gval_integrated(1);
gyro_report.z_integral = gval_integrated(2);
// If we are not receiving the last sample from the FIFO buffer yet, let's stop here
// and wait for more packets.
if (!data.is_last_fifo_sample) {
return 0;
}
// The driver empties the FIFO buffer at 1kHz, however we only need to publish at 250Hz.
// Therefore, only publish every forth time.
++_publish_count;
if (_publish_count < 4) {
return 0;
}
_publish_count = 0;
// Update all the counters.
perf_set_count(_read_counter, data.read_counter);
perf_set_count(_error_counter, data.error_counter);
perf_set_count(_fifo_overflow_counter, data.fifo_overflow_counter);
perf_set_count(_fifo_corruption_counter, data.fifo_overflow_counter);
perf_set_count(_gyro_range_hit_counter, data.gyro_range_hit_counter);
perf_set_count(_accel_range_hit_counter, data.accel_range_hit_counter);
if (_mag_enabled) {
perf_set_count(_mag_fifo_overflow_counter, data.mag_fifo_overflow_counter);
}
perf_begin(_publish_perf);
// TODO: get these right
gyro_report.scaling = -1.0f;
gyro_report.range_rad_s = -1.0f;
gyro_report.device_id = m_id.dev_id;
accel_report.scaling = -1.0f;
accel_report.range_m_s2 = -1.0f;
accel_report.device_id = m_id.dev_id;
if (_mag_enabled) {
mag_report.timestamp = accel_report.timestamp;
mag_report.is_external = false;
mag_report.scaling = -1.0f;
mag_report.range_ga = -1.0f;
mag_report.device_id = m_id.dev_id;
xraw_f = data.mag_ga_x;
yraw_f = data.mag_ga_y;
zraw_f = data.mag_ga_z;
rotate_3f(_rotation, xraw_f, yraw_f, zraw_f);
// MPU9250 driver from DriverFramework does not provide any raw values
// TEMP We misuse the raw values on the Snapdragon to publish unfiltered data for VISLAM
mag_report.x_raw = xraw_f * 1000; // (int16) [Gs * 1000]
mag_report.y_raw = yraw_f * 1000; // (int16) [Gs * 1000]
mag_report.z_raw = zraw_f * 1000; // (int16) [Gs * 1000]
mag_report.x = (xraw_f - _mag_calibration.x_offset) * _mag_calibration.x_scale;
mag_report.y = (yraw_f - _mag_calibration.y_offset) * _mag_calibration.y_scale;
mag_report.z = (zraw_f - _mag_calibration.z_offset) * _mag_calibration.z_scale;
}
// TODO: when is this ever blocked?
if (!(m_pub_blocked)) {
if (_gyro_topic != nullptr) {
orb_publish(ORB_ID(sensor_gyro), _gyro_topic, &gyro_report);
}
if (_accel_topic != nullptr) {
orb_publish(ORB_ID(sensor_accel), _accel_topic, &accel_report);
}
if (_mag_enabled) {
if (_mag_topic == nullptr) {
_mag_topic = orb_advertise_multi(ORB_ID(sensor_mag), &mag_report,
&_mag_orb_class_instance, ORB_PRIO_LOW);
} else {
orb_publish(ORB_ID(sensor_mag), _mag_topic, &mag_report);
}
}
// Report if there are high vibrations, every 10 times it happens.
const bool threshold_reached = (data.accel_range_hit_counter - _last_accel_range_hit_count > 10);
// Report every 5s.
const bool due_to_report = (hrt_elapsed_time(&_last_accel_range_hit_time) > 5000000);
if (threshold_reached && due_to_report) {
mavlink_log_critical(&_mavlink_log_pub,
"High accelerations, range exceeded %llu times",
data.accel_range_hit_counter);
_last_accel_range_hit_time = hrt_absolute_time();
_last_accel_range_hit_count = data.accel_range_hit_counter;
}
}
perf_end(_publish_perf);
// TODO: check the return codes of this function
return 0;
};
int
MEASAirspeed::collect()
{
int ret = -EIO;
/* read from the sensor */
uint8_t val[4] = {0, 0, 0, 0};
perf_begin(_sample_perf);
ret = transfer(nullptr, 0, &val[0], 4);
if (ret < 0) {
perf_count(_comms_errors);
perf_end(_sample_perf);
return ret;
}
uint8_t status = (val[0] & 0xC0) >> 6;
switch (status) {
case 0:
break;
case 1:
/* fallthrough */
case 2:
/* fallthrough */
case 3:
perf_count(_comms_errors);
perf_end(_sample_perf);
return -EAGAIN;
}
int16_t dp_raw = 0, dT_raw = 0;
dp_raw = (val[0] << 8) + val[1];
/* mask the used bits */
dp_raw = 0x3FFF & dp_raw;
dT_raw = (val[2] << 8) + val[3];
dT_raw = (0xFFE0 & dT_raw) >> 5;
float temperature = ((200.0f * dT_raw) / 2047) - 50;
// Calculate differential pressure. As its centered around 8000
// and can go positive or negative
const float P_min = -1.0f;
const float P_max = 1.0f;
const float PSI_to_Pa = 6894.757f;
/*
this equation is an inversion of the equation in the
pressure transfer function figure on page 4 of the datasheet
We negate the result so that positive differential pressures
are generated when the bottom port is used as the static
port on the pitot and top port is used as the dynamic port
*/
float diff_press_PSI = -((dp_raw - 0.1f*16383) * (P_max-P_min)/(0.8f*16383) + P_min);
float diff_press_pa_raw = diff_press_PSI * PSI_to_Pa;
// correct for 5V rail voltage if possible
voltage_correction(diff_press_pa_raw, temperature);
// the raw value still should be compensated for the known offset
diff_press_pa_raw -= _diff_pres_offset;
float diff_press_pa = fabsf(diff_press_pa_raw);
/*
note that we return both the absolute value with offset
applied and a raw value without the offset applied. This
makes it possible for higher level code to detect if the
user has the tubes connected backwards, and also makes it
possible to correctly use offsets calculated by a higher
level airspeed driver.
With the above calculation the MS4525 sensor will produce a
positive number when the top port is used as a dynamic port
and bottom port is used as the static port
Also note that the _diff_pres_offset is applied before the
fabsf() not afterwards. It needs to be done this way to
prevent a bias at low speeds, but this also means that when
setting a offset you must set it based on the raw value, not
the offset value
*/
struct differential_pressure_s report;
/* track maximum differential pressure measured (so we can work out top speed). */
if (diff_press_pa > _max_differential_pressure_pa) {
_max_differential_pressure_pa = diff_press_pa;
}
report.timestamp = hrt_absolute_time();
report.error_count = perf_event_count(_comms_errors);
report.temperature = temperature;
report.differential_pressure_pa = diff_press_pa;
report.differential_pressure_filtered_pa = _filter.apply(diff_press_pa);
/* the dynamics of the filter can make it overshoot into the negative range */
if (report.differential_pressure_filtered_pa < 0.0f) {
report.differential_pressure_filtered_pa = _filter.reset(diff_press_pa);
}
report.differential_pressure_raw_pa = diff_press_pa_raw;
report.max_differential_pressure_pa = _max_differential_pressure_pa;
if (_airspeed_pub > 0 && !(_pub_blocked)) {
/* publish it */
orb_publish(ORB_ID(differential_pressure), _airspeed_pub, &report);
}
new_report(report);
/* notify anyone waiting for data */
poll_notify(POLLIN);
ret = OK;
perf_end(_sample_perf);
return ret;
}
int
ACCELSIM::devIOCTL(unsigned long cmd, unsigned long arg)
{
unsigned long ul_arg = (unsigned long)arg;
switch (cmd) {
case SENSORIOCSPOLLRATE: {
switch (ul_arg) {
/* switching to manual polling */
case SENSOR_POLLRATE_MANUAL:
stop();
m_sample_interval_usecs = 0;
return OK;
/* external signalling not supported */
case SENSOR_POLLRATE_EXTERNAL:
/* zero would be bad */
case 0:
return -EINVAL;
/* set default/max polling rate */
case SENSOR_POLLRATE_MAX:
return devIOCTL(SENSORIOCSPOLLRATE, 1600);
case SENSOR_POLLRATE_DEFAULT:
return devIOCTL(SENSORIOCSPOLLRATE, ACCELSIM_ACCEL_DEFAULT_RATE);
/* adjust to a legal polling interval in Hz */
default: {
/* convert hz to hrt interval via microseconds */
unsigned interval = 1000000 / ul_arg;
/* check against maximum sane rate */
if (interval < 500) {
return -EINVAL;
}
/* adjust filters */
accel_set_driver_lowpass_filter((float)ul_arg, _accel_filter_x.get_cutoff_freq());
bool want_start = (m_sample_interval_usecs == 0);
/* update interval for next measurement */
setSampleInterval(interval);
if (want_start) {
start();
}
return OK;
}
}
}
case SENSORIOCGPOLLRATE:
if (m_sample_interval_usecs == 0) {
return SENSOR_POLLRATE_MANUAL;
}
return 1000000 / m_sample_interval_usecs;
case SENSORIOCSQUEUEDEPTH: {
/* lower bound is mandatory, upper bound is a sanity check */
if ((ul_arg < 1) || (ul_arg > 100)) {
return -EINVAL;
}
if (!_accel_reports->resize(ul_arg)) {
return -ENOMEM;
}
return OK;
}
case SENSORIOCGQUEUEDEPTH:
return _accel_reports->size();
case SENSORIOCRESET:
// Nothing to do for simulator
return OK;
case ACCELIOCSSAMPLERATE:
// No need to set internal sampling rate for simulator
return OK;
case ACCELIOCGSAMPLERATE:
return _accel_samplerate;
case ACCELIOCSLOWPASS: {
return accel_set_driver_lowpass_filter((float)_accel_samplerate, (float)ul_arg);
}
case ACCELIOCSSCALE: {
/* copy scale, but only if off by a few percent */
struct accel_calibration_s *s = (struct accel_calibration_s *) arg;
float sum = s->x_scale + s->y_scale + s->z_scale;
if (sum > 2.0f && sum < 4.0f) {
memcpy(&_accel_scale, s, sizeof(_accel_scale));
return OK;
} else {
return -EINVAL;
}
}
case ACCELIOCSRANGE:
/* arg needs to be in G */
return accel_set_range(ul_arg);
case ACCELIOCGRANGE:
/* convert to m/s^2 and return rounded in G */
return (unsigned long)((_accel_range_m_s2) / ACCELSIM_ONE_G + 0.5f);
case ACCELIOCGSCALE:
/* copy scale out */
memcpy((struct accel_calibration_s *) arg, &(_accel_scale), sizeof(_accel_scale));
return OK;
case ACCELIOCSELFTEST:
return OK;
default:
/* give it to the superclass */
return VirtDevObj::devIOCTL(cmd, arg);
}
}
void Ekf2::task_main()
{
// subscribe to relevant topics
_sensors_sub = orb_subscribe(ORB_ID(sensor_combined));
_gps_sub = orb_subscribe(ORB_ID(vehicle_gps_position));
_airspeed_sub = orb_subscribe(ORB_ID(airspeed));
_params_sub = orb_subscribe(ORB_ID(parameter_update));
_optical_flow_sub = orb_subscribe(ORB_ID(optical_flow));
_range_finder_sub = orb_subscribe(ORB_ID(distance_sensor));
_vehicle_land_detected_sub = orb_subscribe(ORB_ID(vehicle_land_detected));
px4_pollfd_struct_t fds[2] = {};
fds[0].fd = _sensors_sub;
fds[0].events = POLLIN;
fds[1].fd = _params_sub;
fds[1].events = POLLIN;
// initialise parameter cache
updateParams();
// initialize data structures outside of loop
// because they will else not always be
// properly populated
sensor_combined_s sensors = {};
vehicle_gps_position_s gps = {};
airspeed_s airspeed = {};
optical_flow_s optical_flow = {};
distance_sensor_s range_finder = {};
vehicle_land_detected_s vehicle_land_detected = {};
while (!_task_should_exit) {
int ret = px4_poll(fds, sizeof(fds) / sizeof(fds[0]), 1000);
if (ret < 0) {
// Poll error, sleep and try again
usleep(10000);
continue;
} else if (ret == 0) {
// Poll timeout or no new data, do nothing
continue;
}
if (fds[1].revents & POLLIN) {
// read from param to clear updated flag
struct parameter_update_s update;
orb_copy(ORB_ID(parameter_update), _params_sub, &update);
updateParams();
// fetch sensor data in next loop
continue;
} else if (!(fds[0].revents & POLLIN)) {
// no new data
continue;
}
bool gps_updated = false;
bool airspeed_updated = false;
bool optical_flow_updated = false;
bool range_finder_updated = false;
bool vehicle_land_detected_updated = false;
orb_copy(ORB_ID(sensor_combined), _sensors_sub, &sensors);
// update all other topics if they have new data
orb_check(_gps_sub, &gps_updated);
if (gps_updated) {
orb_copy(ORB_ID(vehicle_gps_position), _gps_sub, &gps);
}
orb_check(_airspeed_sub, &airspeed_updated);
if (airspeed_updated) {
orb_copy(ORB_ID(airspeed), _airspeed_sub, &airspeed);
}
orb_check(_optical_flow_sub, &optical_flow_updated);
if (optical_flow_updated) {
orb_copy(ORB_ID(optical_flow), _optical_flow_sub, &optical_flow);
}
orb_check(_range_finder_sub, &range_finder_updated);
if (range_finder_updated) {
orb_copy(ORB_ID(distance_sensor), _range_finder_sub, &range_finder);
}
// in replay mode we are getting the actual timestamp from the sensor topic
hrt_abstime now = 0;
if (_replay_mode) {
now = sensors.timestamp;
} else {
now = hrt_absolute_time();
}
// push imu data into estimator
_ekf.setIMUData(now, sensors.gyro_integral_dt[0], sensors.accelerometer_integral_dt[0],
&sensors.gyro_integral_rad[0], &sensors.accelerometer_integral_m_s[0]);
// read mag data
_ekf.setMagData(sensors.magnetometer_timestamp[0], &sensors.magnetometer_ga[0]);
// read baro data
_ekf.setBaroData(sensors.baro_timestamp[0], &sensors.baro_alt_meter[0]);
// read gps data if available
if (gps_updated) {
struct gps_message gps_msg = {};
gps_msg.time_usec = gps.timestamp_position;
gps_msg.lat = gps.lat;
gps_msg.lon = gps.lon;
gps_msg.alt = gps.alt;
gps_msg.fix_type = gps.fix_type;
gps_msg.eph = gps.eph;
gps_msg.epv = gps.epv;
gps_msg.sacc = gps.s_variance_m_s;
gps_msg.time_usec_vel = gps.timestamp_velocity;
gps_msg.vel_m_s = gps.vel_m_s;
gps_msg.vel_ned[0] = gps.vel_n_m_s;
gps_msg.vel_ned[1] = gps.vel_e_m_s;
gps_msg.vel_ned[2] = gps.vel_d_m_s;
gps_msg.vel_ned_valid = gps.vel_ned_valid;
gps_msg.nsats = gps.satellites_used;
//TODO add gdop to gps topic
gps_msg.gdop = 0.0f;
_ekf.setGpsData(gps.timestamp_position, &gps_msg);
}
// read airspeed data if available
float eas2tas = airspeed.true_airspeed_m_s / airspeed.indicated_airspeed_m_s;
if (airspeed_updated && airspeed.true_airspeed_m_s > 7.0f) {
_ekf.setAirspeedData(airspeed.timestamp, &airspeed.true_airspeed_m_s, &eas2tas);
}
if (optical_flow_updated) {
flow_message flow;
flow.flowdata(0) = optical_flow.pixel_flow_x_integral;
flow.flowdata(1) = optical_flow.pixel_flow_y_integral;
flow.quality = optical_flow.quality;
flow.gyrodata(0) = optical_flow.gyro_x_rate_integral;
flow.gyrodata(1) = optical_flow.gyro_y_rate_integral;
flow.gyrodata(2) = optical_flow.gyro_z_rate_integral;
flow.dt = optical_flow.integration_timespan;
if (PX4_ISFINITE(optical_flow.pixel_flow_y_integral) &&
PX4_ISFINITE(optical_flow.pixel_flow_x_integral)) {
_ekf.setOpticalFlowData(optical_flow.timestamp, &flow);
}
}
if (range_finder_updated) {
_ekf.setRangeData(range_finder.timestamp, &range_finder.current_distance);
}
orb_check(_vehicle_land_detected_sub, &vehicle_land_detected_updated);
if (vehicle_land_detected_updated) {
orb_copy(ORB_ID(vehicle_land_detected), _vehicle_land_detected_sub, &vehicle_land_detected);
_ekf.set_in_air_status(!vehicle_land_detected.landed);
}
// run the EKF update and output
if (_ekf.update()) {
// generate vehicle attitude quaternion data
struct vehicle_attitude_s att = {};
_ekf.copy_quaternion(att.q);
matrix::Quaternion<float> q(att.q[0], att.q[1], att.q[2], att.q[3]);
// generate control state data
control_state_s ctrl_state = {};
ctrl_state.timestamp = hrt_absolute_time();
ctrl_state.roll_rate = _lp_roll_rate.apply(sensors.gyro_rad_s[0]);
ctrl_state.pitch_rate = _lp_pitch_rate.apply(sensors.gyro_rad_s[1]);
ctrl_state.yaw_rate = _lp_yaw_rate.apply(sensors.gyro_rad_s[2]);
// Velocity in body frame
float velocity[3];
_ekf.get_velocity(velocity);
Vector3f v_n(velocity);
matrix::Dcm<float> R_to_body(q.inversed());
Vector3f v_b = R_to_body * v_n;
ctrl_state.x_vel = v_b(0);
ctrl_state.y_vel = v_b(1);
ctrl_state.z_vel = v_b(2);
// Local Position NED
float position[3];
_ekf.get_position(position);
ctrl_state.x_pos = position[0];
ctrl_state.y_pos = position[1];
ctrl_state.z_pos = position[2];
// Attitude quaternion
ctrl_state.q[0] = q(0);
ctrl_state.q[1] = q(1);
ctrl_state.q[2] = q(2);
ctrl_state.q[3] = q(3);
// Acceleration data
matrix::Vector<float, 3> acceleration = {&sensors.accelerometer_m_s2[0]};
float accel_bias[3];
_ekf.get_accel_bias(accel_bias);
ctrl_state.x_acc = acceleration(0) - accel_bias[0];
ctrl_state.y_acc = acceleration(1) - accel_bias[1];
ctrl_state.z_acc = acceleration(2) - accel_bias[2];
// compute lowpass filtered horizontal acceleration
acceleration = R_to_body.transpose() * acceleration;
_acc_hor_filt = 0.95f * _acc_hor_filt + 0.05f * sqrtf(acceleration(0) * acceleration(0) + acceleration(
1) * acceleration(1));
ctrl_state.horz_acc_mag = _acc_hor_filt;
// Airspeed - take airspeed measurement directly here as no wind is estimated
if (PX4_ISFINITE(airspeed.indicated_airspeed_m_s) && hrt_absolute_time() - airspeed.timestamp < 1e6
&& airspeed.timestamp > 0) {
ctrl_state.airspeed = airspeed.indicated_airspeed_m_s;
ctrl_state.airspeed_valid = true;
} else {
ctrl_state.airspeed_valid = false;
}
// publish control state data
if (_control_state_pub == nullptr) {
_control_state_pub = orb_advertise(ORB_ID(control_state), &ctrl_state);
} else {
orb_publish(ORB_ID(control_state), _control_state_pub, &ctrl_state);
}
// generate remaining vehicle attitude data
att.timestamp = hrt_absolute_time();
matrix::Euler<float> euler(q);
att.roll = euler(0);
att.pitch = euler(1);
att.yaw = euler(2);
att.q[0] = q(0);
att.q[1] = q(1);
att.q[2] = q(2);
att.q[3] = q(3);
att.q_valid = true;
att.rollspeed = sensors.gyro_rad_s[0];
att.pitchspeed = sensors.gyro_rad_s[1];
att.yawspeed = sensors.gyro_rad_s[2];
// publish vehicle attitude data
if (_att_pub == nullptr) {
_att_pub = orb_advertise(ORB_ID(vehicle_attitude), &att);
} else {
orb_publish(ORB_ID(vehicle_attitude), _att_pub, &att);
}
// generate vehicle local position data
struct vehicle_local_position_s lpos = {};
float pos[3] = {};
float vel[3] = {};
lpos.timestamp = hrt_absolute_time();
// Position of body origin in local NED frame
_ekf.get_position(pos);
lpos.x = pos[0];
lpos.y = pos[1];
lpos.z = pos[2];
// Velocity of body origin in local NED frame (m/s)
_ekf.get_velocity(vel);
lpos.vx = vel[0];
lpos.vy = vel[1];
lpos.vz = vel[2];
// TODO: better status reporting
lpos.xy_valid = _ekf.local_position_is_valid();
lpos.z_valid = true;
lpos.v_xy_valid = _ekf.local_position_is_valid();
lpos.v_z_valid = true;
// Position of local NED origin in GPS / WGS84 frame
struct map_projection_reference_s ekf_origin = {};
// true if position (x, y) is valid and has valid global reference (ref_lat, ref_lon)
_ekf.get_ekf_origin(&lpos.ref_timestamp, &ekf_origin, &lpos.ref_alt);
lpos.xy_global = _ekf.global_position_is_valid();
lpos.z_global = true; // true if z is valid and has valid global reference (ref_alt)
lpos.ref_lat = ekf_origin.lat_rad * 180.0 / M_PI; // Reference point latitude in degrees
lpos.ref_lon = ekf_origin.lon_rad * 180.0 / M_PI; // Reference point longitude in degrees
// The rotation of the tangent plane vs. geographical north
lpos.yaw = att.yaw;
float terrain_vpos;
lpos.dist_bottom_valid = _ekf.get_terrain_vert_pos(&terrain_vpos);
lpos.dist_bottom = terrain_vpos - pos[2]; // Distance to bottom surface (ground) in meters
lpos.dist_bottom_rate = -vel[2]; // Distance to bottom surface (ground) change rate
lpos.surface_bottom_timestamp = hrt_absolute_time(); // Time when new bottom surface found
// TODO: uORB definition does not define what these variables are. We have assumed them to be horizontal and vertical 1-std dev accuracy in metres
Vector3f pos_var, vel_var;
_ekf.get_pos_var(pos_var);
_ekf.get_vel_var(vel_var);
lpos.eph = sqrt(pos_var(0) + pos_var(1));
lpos.epv = sqrt(pos_var(2));
// publish vehicle local position data
if (_lpos_pub == nullptr) {
_lpos_pub = orb_advertise(ORB_ID(vehicle_local_position), &lpos);
} else {
orb_publish(ORB_ID(vehicle_local_position), _lpos_pub, &lpos);
}
// generate and publish global position data
struct vehicle_global_position_s global_pos = {};
if (_ekf.global_position_is_valid()) {
global_pos.timestamp = hrt_absolute_time(); // Time of this estimate, in microseconds since system start
global_pos.time_utc_usec = gps.time_utc_usec; // GPS UTC timestamp in microseconds
double est_lat, est_lon;
map_projection_reproject(&ekf_origin, lpos.x, lpos.y, &est_lat, &est_lon);
global_pos.lat = est_lat; // Latitude in degrees
global_pos.lon = est_lon; // Longitude in degrees
global_pos.alt = -pos[2] + lpos.ref_alt; // Altitude AMSL in meters
global_pos.vel_n = vel[0]; // Ground north velocity, m/s
global_pos.vel_e = vel[1]; // Ground east velocity, m/s
global_pos.vel_d = vel[2]; // Ground downside velocity, m/s
global_pos.yaw = euler(2); // Yaw in radians -PI..+PI.
global_pos.eph = sqrt(pos_var(0) + pos_var(1));; // Standard deviation of position estimate horizontally
global_pos.epv = sqrt(pos_var(2)); // Standard deviation of position vertically
// TODO: implement terrain estimator
global_pos.terrain_alt = 0.0f; // Terrain altitude in m, WGS84
global_pos.terrain_alt_valid = false; // Terrain altitude estimate is valid
// TODO use innovatun consistency check timouts to set this
global_pos.dead_reckoning = false; // True if this position is estimated through dead-reckoning
global_pos.pressure_alt = sensors.baro_alt_meter[0]; // Pressure altitude AMSL (m)
if (_vehicle_global_position_pub == nullptr) {
_vehicle_global_position_pub = orb_advertise(ORB_ID(vehicle_global_position), &global_pos);
} else {
orb_publish(ORB_ID(vehicle_global_position), _vehicle_global_position_pub, &global_pos);
}
}
} else if (_replay_mode) {
// in replay mode we have to tell the replay module not to wait for an update
// we do this by publishing an attitude with zero timestamp
struct vehicle_attitude_s att = {};
att.timestamp = 0;
if (_att_pub == nullptr) {
_att_pub = orb_advertise(ORB_ID(vehicle_attitude), &att);
} else {
orb_publish(ORB_ID(vehicle_attitude), _att_pub, &att);
}
}
// publish estimator status
struct estimator_status_s status = {};
status.timestamp = hrt_absolute_time();
_ekf.get_state_delayed(status.states);
_ekf.get_covariances(status.covariances);
_ekf.get_gps_check_status(&status.gps_check_fail_flags);
_ekf.get_control_mode(&status.control_mode_flags);
_ekf.get_filter_fault_status(&status.filter_fault_flags);
if (_estimator_status_pub == nullptr) {
_estimator_status_pub = orb_advertise(ORB_ID(estimator_status), &status);
} else {
orb_publish(ORB_ID(estimator_status), _estimator_status_pub, &status);
}
// Publish wind estimate
struct wind_estimate_s wind_estimate = {};
wind_estimate.timestamp = hrt_absolute_time();
wind_estimate.windspeed_north = status.states[22];
wind_estimate.windspeed_east = status.states[23];
wind_estimate.covariance_north = status.covariances[22];
wind_estimate.covariance_east = status.covariances[23];
if (_wind_pub == nullptr) {
_wind_pub = orb_advertise(ORB_ID(wind_estimate), &wind_estimate);
} else {
orb_publish(ORB_ID(wind_estimate), _wind_pub, &wind_estimate);
}
// publish estimator innovation data
struct ekf2_innovations_s innovations = {};
innovations.timestamp = hrt_absolute_time();
_ekf.get_vel_pos_innov(&innovations.vel_pos_innov[0]);
_ekf.get_mag_innov(&innovations.mag_innov[0]);
_ekf.get_heading_innov(&innovations.heading_innov);
_ekf.get_airspeed_innov(&innovations.airspeed_innov);
_ekf.get_flow_innov(&innovations.flow_innov[0]);
_ekf.get_hagl_innov(&innovations.hagl_innov);
_ekf.get_vel_pos_innov_var(&innovations.vel_pos_innov_var[0]);
_ekf.get_mag_innov_var(&innovations.mag_innov_var[0]);
_ekf.get_heading_innov_var(&innovations.heading_innov_var);
_ekf.get_airspeed_innov_var(&innovations.airspeed_innov_var);
_ekf.get_flow_innov_var(&innovations.flow_innov_var[0]);
_ekf.get_hagl_innov_var(&innovations.hagl_innov_var);
if (_estimator_innovations_pub == nullptr) {
_estimator_innovations_pub = orb_advertise(ORB_ID(ekf2_innovations), &innovations);
} else {
orb_publish(ORB_ID(ekf2_innovations), _estimator_innovations_pub, &innovations);
}
// save the declination to the EKF2_MAG_DECL parameter when a land event is detected
if ((_params->mag_declination_source & (1 << 1)) && !_prev_landed && vehicle_land_detected.landed) {
float decl_deg;
_ekf.copy_mag_decl_deg(&decl_deg);
_mag_declination_deg.set(decl_deg);
}
_prev_landed = vehicle_land_detected.landed;
// publish replay message if in replay mode
bool publish_replay_message = (bool)_param_record_replay_msg.get();
if (publish_replay_message) {
struct ekf2_replay_s replay = {};
replay.time_ref = now;
replay.gyro_integral_dt = sensors.gyro_integral_dt[0];
replay.accelerometer_integral_dt = sensors.accelerometer_integral_dt[0];
replay.magnetometer_timestamp = sensors.magnetometer_timestamp[0];
replay.baro_timestamp = sensors.baro_timestamp[0];
memcpy(&replay.gyro_integral_rad[0], &sensors.gyro_integral_rad[0], sizeof(replay.gyro_integral_rad));
memcpy(&replay.accelerometer_integral_m_s[0], &sensors.accelerometer_integral_m_s[0],
sizeof(replay.accelerometer_integral_m_s));
memcpy(&replay.magnetometer_ga[0], &sensors.magnetometer_ga[0], sizeof(replay.magnetometer_ga));
replay.baro_alt_meter = sensors.baro_alt_meter[0];
// only write gps data if we had a gps update.
if (gps_updated) {
replay.time_usec = gps.timestamp_position;
replay.time_usec_vel = gps.timestamp_velocity;
replay.lat = gps.lat;
replay.lon = gps.lon;
replay.alt = gps.alt;
replay.fix_type = gps.fix_type;
replay.nsats = gps.satellites_used;
replay.eph = gps.eph;
replay.epv = gps.epv;
replay.sacc = gps.s_variance_m_s;
replay.vel_m_s = gps.vel_m_s;
replay.vel_n_m_s = gps.vel_n_m_s;
replay.vel_e_m_s = gps.vel_e_m_s;
replay.vel_d_m_s = gps.vel_d_m_s;
replay.vel_ned_valid = gps.vel_ned_valid;
} else {
// this will tell the logging app not to bother logging any gps replay data
replay.time_usec = 0;
}
if (optical_flow_updated) {
replay.flow_timestamp = optical_flow.timestamp;
replay.flow_pixel_integral[0] = optical_flow.pixel_flow_x_integral;
replay.flow_pixel_integral[1] = optical_flow.pixel_flow_y_integral;
replay.flow_gyro_integral[0] = optical_flow.gyro_x_rate_integral;
replay.flow_gyro_integral[1] = optical_flow.gyro_y_rate_integral;
replay.flow_time_integral = optical_flow.integration_timespan;
replay.flow_quality = optical_flow.quality;
} else {
replay.flow_timestamp = 0;
}
if (range_finder_updated) {
replay.rng_timestamp = range_finder.timestamp;
replay.range_to_ground = range_finder.current_distance;
} else {
replay.rng_timestamp = 0;
}
if (airspeed_updated) {
replay.asp_timestamp = airspeed.timestamp;
replay.indicated_airspeed_m_s = airspeed.indicated_airspeed_m_s;
replay.true_airspeed_m_s = airspeed.true_airspeed_m_s;
replay.true_airspeed_unfiltered_m_s = airspeed.true_airspeed_unfiltered_m_s;
replay.air_temperature_celsius = airspeed.air_temperature_celsius;
replay.confidence = airspeed.confidence;
} else {
replay.asp_timestamp = 0;
}
if (_replay_pub == nullptr) {
_replay_pub = orb_advertise(ORB_ID(ekf2_replay), &replay);
} else {
orb_publish(ORB_ID(ekf2_replay), _replay_pub, &replay);
}
}
}
delete ekf2::instance;
ekf2::instance = nullptr;
}
void AttitudeEstimatorQ::task_main()
{
#ifdef __PX4_POSIX
perf_counter_t _perf_accel(perf_alloc_once(PC_ELAPSED, "sim_accel_delay"));
perf_counter_t _perf_mpu(perf_alloc_once(PC_ELAPSED, "sim_mpu_delay"));
perf_counter_t _perf_mag(perf_alloc_once(PC_ELAPSED, "sim_mag_delay"));
#endif
_sensors_sub = orb_subscribe(ORB_ID(sensor_combined));
_vision_sub = orb_subscribe(ORB_ID(vision_position_estimate));
_mocap_sub = orb_subscribe(ORB_ID(att_pos_mocap));
_airspeed_sub = orb_subscribe(ORB_ID(airspeed));
_params_sub = orb_subscribe(ORB_ID(parameter_update));
_global_pos_sub = orb_subscribe(ORB_ID(vehicle_global_position));
update_parameters(true);
hrt_abstime last_time = 0;
px4_pollfd_struct_t fds[1] = {};
fds[0].fd = _sensors_sub;
fds[0].events = POLLIN;
while (!_task_should_exit) {
int ret = px4_poll(fds, 1, 1000);
if (ret < 0) {
// Poll error, sleep and try again
usleep(10000);
PX4_WARN("Q POLL ERROR");
continue;
} else if (ret == 0) {
// Poll timeout, do nothing
PX4_WARN("Q POLL TIMEOUT");
continue;
}
update_parameters(false);
// Update sensors
sensor_combined_s sensors;
int best_gyro = 0;
int best_accel = 0;
int best_mag = 0;
if (!orb_copy(ORB_ID(sensor_combined), _sensors_sub, &sensors)) {
// Feed validator with recent sensor data
for (unsigned i = 0; i < (sizeof(sensors.gyro_timestamp) / sizeof(sensors.gyro_timestamp[0])); i++) {
/* ignore empty fields */
if (sensors.gyro_timestamp[i] > 0) {
float gyro[3];
for (unsigned j = 0; j < 3; j++) {
if (sensors.gyro_integral_dt[i] > 0) {
gyro[j] = (double)sensors.gyro_integral_rad[i * 3 + j] / (sensors.gyro_integral_dt[i] / 1e6);
} else {
/* fall back to angular rate */
gyro[j] = sensors.gyro_rad_s[i * 3 + j];
}
}
_voter_gyro.put(i, sensors.gyro_timestamp[i], &gyro[0], sensors.gyro_errcount[i], sensors.gyro_priority[i]);
}
/* ignore empty fields */
if (sensors.accelerometer_timestamp[i] > 0) {
_voter_accel.put(i, sensors.accelerometer_timestamp[i], &sensors.accelerometer_m_s2[i * 3],
sensors.accelerometer_errcount[i], sensors.accelerometer_priority[i]);
}
/* ignore empty fields */
if (sensors.magnetometer_timestamp[i] > 0) {
_voter_mag.put(i, sensors.magnetometer_timestamp[i], &sensors.magnetometer_ga[i * 3],
sensors.magnetometer_errcount[i], sensors.magnetometer_priority[i]);
}
}
// Get best measurement values
hrt_abstime curr_time = hrt_absolute_time();
_gyro.set(_voter_gyro.get_best(curr_time, &best_gyro));
_accel.set(_voter_accel.get_best(curr_time, &best_accel));
_mag.set(_voter_mag.get_best(curr_time, &best_mag));
if (_accel.length() < 0.01f) {
warnx("WARNING: degenerate accel!");
continue;
}
if (_mag.length() < 0.01f) {
warnx("WARNING: degenerate mag!");
continue;
}
_data_good = true;
if (!_failsafe) {
uint32_t flags = DataValidator::ERROR_FLAG_NO_ERROR;
#ifdef __PX4_POSIX
perf_end(_perf_accel);
perf_end(_perf_mpu);
perf_end(_perf_mag);
#endif
if (_voter_gyro.failover_count() > 0) {
_failsafe = true;
flags = _voter_gyro.failover_state();
mavlink_and_console_log_emergency(&_mavlink_log_pub, "Gyro #%i failure :%s%s%s%s%s!",
_voter_gyro.failover_index(),
((flags & DataValidator::ERROR_FLAG_NO_DATA) ? " No data" : ""),
((flags & DataValidator::ERROR_FLAG_STALE_DATA) ? " Stale data" : ""),
((flags & DataValidator::ERROR_FLAG_TIMEOUT) ? " Data timeout" : ""),
((flags & DataValidator::ERROR_FLAG_HIGH_ERRCOUNT) ? " High error count" : ""),
((flags & DataValidator::ERROR_FLAG_HIGH_ERRDENSITY) ? " High error density" : ""));
}
if (_voter_accel.failover_count() > 0) {
_failsafe = true;
flags = _voter_accel.failover_state();
mavlink_and_console_log_emergency(&_mavlink_log_pub, "Accel #%i failure :%s%s%s%s%s!",
_voter_accel.failover_index(),
((flags & DataValidator::ERROR_FLAG_NO_DATA) ? " No data" : ""),
((flags & DataValidator::ERROR_FLAG_STALE_DATA) ? " Stale data" : ""),
((flags & DataValidator::ERROR_FLAG_TIMEOUT) ? " Data timeout" : ""),
((flags & DataValidator::ERROR_FLAG_HIGH_ERRCOUNT) ? " High error count" : ""),
((flags & DataValidator::ERROR_FLAG_HIGH_ERRDENSITY) ? " High error density" : ""));
}
if (_voter_mag.failover_count() > 0) {
_failsafe = true;
flags = _voter_mag.failover_state();
mavlink_and_console_log_emergency(&_mavlink_log_pub, "Mag #%i failure :%s%s%s%s%s!",
_voter_mag.failover_index(),
((flags & DataValidator::ERROR_FLAG_NO_DATA) ? " No data" : ""),
((flags & DataValidator::ERROR_FLAG_STALE_DATA) ? " Stale data" : ""),
((flags & DataValidator::ERROR_FLAG_TIMEOUT) ? " Data timeout" : ""),
((flags & DataValidator::ERROR_FLAG_HIGH_ERRCOUNT) ? " High error count" : ""),
((flags & DataValidator::ERROR_FLAG_HIGH_ERRDENSITY) ? " High error density" : ""));
}
if (_failsafe) {
mavlink_and_console_log_emergency(&_mavlink_log_pub, "SENSOR FAILSAFE! RETURN TO LAND IMMEDIATELY");
}
}
if (!_vibration_warning && (_voter_gyro.get_vibration_factor(curr_time) > _vibration_warning_threshold ||
_voter_accel.get_vibration_factor(curr_time) > _vibration_warning_threshold ||
_voter_mag.get_vibration_factor(curr_time) > _vibration_warning_threshold)) {
if (_vibration_warning_timestamp == 0) {
_vibration_warning_timestamp = curr_time;
} else if (hrt_elapsed_time(&_vibration_warning_timestamp) > 10000000) {
_vibration_warning = true;
mavlink_and_console_log_critical(&_mavlink_log_pub, "HIGH VIBRATION! g: %d a: %d m: %d",
(int)(100 * _voter_gyro.get_vibration_factor(curr_time)),
(int)(100 * _voter_accel.get_vibration_factor(curr_time)),
(int)(100 * _voter_mag.get_vibration_factor(curr_time)));
}
} else {
_vibration_warning_timestamp = 0;
}
}
// Update vision and motion capture heading
bool vision_updated = false;
orb_check(_vision_sub, &vision_updated);
bool mocap_updated = false;
orb_check(_mocap_sub, &mocap_updated);
if (vision_updated) {
orb_copy(ORB_ID(vision_position_estimate), _vision_sub, &_vision);
math::Quaternion q(_vision.q);
math::Matrix<3, 3> Rvis = q.to_dcm();
math::Vector<3> v(1.0f, 0.0f, 0.4f);
// Rvis is Rwr (robot respect to world) while v is respect to world.
// Hence Rvis must be transposed having (Rwr)' * Vw
// Rrw * Vw = vn. This way we have consistency
_vision_hdg = Rvis.transposed() * v;
}
if (mocap_updated) {
orb_copy(ORB_ID(att_pos_mocap), _mocap_sub, &_mocap);
math::Quaternion q(_mocap.q);
math::Matrix<3, 3> Rmoc = q.to_dcm();
math::Vector<3> v(1.0f, 0.0f, 0.4f);
// Rmoc is Rwr (robot respect to world) while v is respect to world.
// Hence Rmoc must be transposed having (Rwr)' * Vw
// Rrw * Vw = vn. This way we have consistency
_mocap_hdg = Rmoc.transposed() * v;
}
// Update airspeed
bool airspeed_updated = false;
orb_check(_airspeed_sub, &airspeed_updated);
if (airspeed_updated) {
orb_copy(ORB_ID(airspeed), _airspeed_sub, &_airspeed);
}
// Check for timeouts on data
if (_ext_hdg_mode == 1) {
_ext_hdg_good = _vision.timestamp_boot > 0 && (hrt_elapsed_time(&_vision.timestamp_boot) < 500000);
} else if (_ext_hdg_mode == 2) {
_ext_hdg_good = _mocap.timestamp_boot > 0 && (hrt_elapsed_time(&_mocap.timestamp_boot) < 500000);
}
bool gpos_updated;
orb_check(_global_pos_sub, &gpos_updated);
if (gpos_updated) {
orb_copy(ORB_ID(vehicle_global_position), _global_pos_sub, &_gpos);
if (_mag_decl_auto && _gpos.eph < 20.0f && hrt_elapsed_time(&_gpos.timestamp) < 1000000) {
/* set magnetic declination automatically */
update_mag_declination(math::radians(get_mag_declination(_gpos.lat, _gpos.lon)));
}
}
if (_acc_comp && _gpos.timestamp != 0 && hrt_absolute_time() < _gpos.timestamp + 20000 && _gpos.eph < 5.0f && _inited) {
/* position data is actual */
if (gpos_updated) {
Vector<3> vel(_gpos.vel_n, _gpos.vel_e, _gpos.vel_d);
/* velocity updated */
if (_vel_prev_t != 0 && _gpos.timestamp != _vel_prev_t) {
float vel_dt = (_gpos.timestamp - _vel_prev_t) / 1000000.0f;
/* calculate acceleration in body frame */
_pos_acc = _q.conjugate_inversed((vel - _vel_prev) / vel_dt);
}
_vel_prev_t = _gpos.timestamp;
_vel_prev = vel;
}
} else {
/* position data is outdated, reset acceleration */
_pos_acc.zero();
_vel_prev.zero();
_vel_prev_t = 0;
}
/* time from previous iteration */
hrt_abstime now = hrt_absolute_time();
float dt = (last_time > 0) ? ((now - last_time) / 1000000.0f) : 0.00001f;
last_time = now;
if (dt > _dt_max) {
dt = _dt_max;
}
if (!update(dt)) {
continue;
}
Vector<3> euler = _q.to_euler();
struct vehicle_attitude_s att = {};
att.timestamp = sensors.timestamp;
att.roll = euler(0);
att.pitch = euler(1);
att.yaw = euler(2);
att.rollspeed = _rates(0);
att.pitchspeed = _rates(1);
att.yawspeed = _rates(2);
for (int i = 0; i < 3; i++) {
att.g_comp[i] = _accel(i) - _pos_acc(i);
}
/* copy offsets */
memcpy(&att.rate_offsets, _gyro_bias.data, sizeof(att.rate_offsets));
Matrix<3, 3> R = _q.to_dcm();
/* copy rotation matrix */
memcpy(&att.R[0], R.data, sizeof(att.R));
att.R_valid = true;
memcpy(&att.q[0], _q.data, sizeof(att.q));
att.q_valid = true;
att.rate_vibration = _voter_gyro.get_vibration_factor(hrt_absolute_time());
att.accel_vibration = _voter_accel.get_vibration_factor(hrt_absolute_time());
att.mag_vibration = _voter_mag.get_vibration_factor(hrt_absolute_time());
/* the instance count is not used here */
int att_inst;
orb_publish_auto(ORB_ID(vehicle_attitude), &_att_pub, &att, &att_inst, ORB_PRIO_HIGH);
{
struct control_state_s ctrl_state = {};
ctrl_state.timestamp = sensors.timestamp;
/* attitude quaternions for control state */
ctrl_state.q[0] = _q(0);
ctrl_state.q[1] = _q(1);
ctrl_state.q[2] = _q(2);
ctrl_state.q[3] = _q(3);
/* attitude rates for control state */
ctrl_state.roll_rate = _lp_roll_rate.apply(_rates(0));
ctrl_state.pitch_rate = _lp_pitch_rate.apply(_rates(1));
ctrl_state.yaw_rate = _lp_yaw_rate.apply(_rates(2));
/* Airspeed - take airspeed measurement directly here as no wind is estimated */
if (PX4_ISFINITE(_airspeed.indicated_airspeed_m_s) && hrt_absolute_time() - _airspeed.timestamp < 1e6
&& _airspeed.timestamp > 0) {
ctrl_state.airspeed = _airspeed.indicated_airspeed_m_s;
ctrl_state.airspeed_valid = true;
} else {
ctrl_state.airspeed_valid = false;
}
/* the instance count is not used here */
int ctrl_inst;
/* publish to control state topic */
orb_publish_auto(ORB_ID(control_state), &_ctrl_state_pub, &ctrl_state, &ctrl_inst, ORB_PRIO_HIGH);
}
{
struct estimator_status_s est = {};
est.timestamp = sensors.timestamp;
est.vibe[0] = _voter_accel.get_vibration_offset(est.timestamp, 0);
est.vibe[1] = _voter_accel.get_vibration_offset(est.timestamp, 1);
est.vibe[2] = _voter_accel.get_vibration_offset(est.timestamp, 2);
/* the instance count is not used here */
int est_inst;
/* publish to control state topic */
orb_publish_auto(ORB_ID(estimator_status), &_est_state_pub, &est, &est_inst, ORB_PRIO_HIGH);
}
}
}
int
L3GD20::ioctl(struct file *filp, int cmd, unsigned long arg)
{
switch (cmd) {
case SENSORIOCSPOLLRATE: {
switch (arg) {
/* switching to manual polling */
case SENSOR_POLLRATE_MANUAL:
stop();
_call_interval = 0;
return OK;
/* external signalling not supported */
case SENSOR_POLLRATE_EXTERNAL:
/* zero would be bad */
case 0:
return -EINVAL;
/* set default/max polling rate */
case SENSOR_POLLRATE_MAX:
case SENSOR_POLLRATE_DEFAULT:
if (_is_l3g4200d) {
return ioctl(filp, SENSORIOCSPOLLRATE, L3G4200D_DEFAULT_RATE);
}
return ioctl(filp, SENSORIOCSPOLLRATE, L3GD20_DEFAULT_RATE);
/* adjust to a legal polling interval in Hz */
default: {
/* do we need to start internal polling? */
bool want_start = (_call_interval == 0);
/* convert hz to hrt interval via microseconds */
unsigned ticks = 1000000 / arg;
/* check against maximum sane rate */
if (ticks < 1000)
return -EINVAL;
/* update interval for next measurement */
/* XXX this is a bit shady, but no other way to adjust... */
_call.period = _call_interval = ticks;
/* adjust filters */
float cutoff_freq_hz = _gyro_filter_x.get_cutoff_freq();
float sample_rate = 1.0e6f/ticks;
set_driver_lowpass_filter(sample_rate, cutoff_freq_hz);
/* if we need to start the poll state machine, do it */
if (want_start)
start();
return OK;
}
}
}
case SENSORIOCGPOLLRATE:
if (_call_interval == 0)
return SENSOR_POLLRATE_MANUAL;
return 1000000 / _call_interval;
case SENSORIOCSQUEUEDEPTH: {
/* lower bound is mandatory, upper bound is a sanity check */
if ((arg < 1) || (arg > 100))
return -EINVAL;
irqstate_t flags = irqsave();
if (!_reports->resize(arg)) {
irqrestore(flags);
return -ENOMEM;
}
irqrestore(flags);
return OK;
}
case SENSORIOCGQUEUEDEPTH:
return _reports->size();
case SENSORIOCRESET:
reset();
return OK;
case GYROIOCSSAMPLERATE:
return set_samplerate(arg, _current_bandwidth);
case GYROIOCGSAMPLERATE:
return _current_rate;
case GYROIOCSLOWPASS: {
// set the software lowpass cut-off in Hz
float cutoff_freq_hz = arg;
float sample_rate = 1.0e6f / _call_interval;
set_driver_lowpass_filter(sample_rate, cutoff_freq_hz);
return OK;
}
case GYROIOCGLOWPASS:
return _gyro_filter_x.get_cutoff_freq();
case GYROIOCSSCALE:
/* copy scale in */
memcpy(&_gyro_scale, (struct gyro_scale *) arg, sizeof(_gyro_scale));
return OK;
case GYROIOCGSCALE:
/* copy scale out */
memcpy((struct gyro_scale *) arg, &_gyro_scale, sizeof(_gyro_scale));
return OK;
case GYROIOCSRANGE:
/* arg should be in dps */
return set_range(arg);
case GYROIOCGRANGE:
/* convert to dps and round */
return (unsigned long)(_gyro_range_rad_s * 180.0f / M_PI_F + 0.5f);
case GYROIOCSELFTEST:
return self_test();
case GYROIOCSHWLOWPASS:
return set_samplerate(_current_rate, arg);
case GYROIOCGHWLOWPASS:
return _current_bandwidth;
default:
/* give it to the superclass */
return SPI::ioctl(filp, cmd, arg);
}
}
void
FXOS8700CQ::measure()
{
/* status register and data as read back from the device */
#pragma pack(push, 1)
struct {
uint8_t cmd[2];
uint8_t status;
int16_t x;
int16_t y;
int16_t z;
int16_t mx;
int16_t my;
int16_t mz;
} raw_accel_mag_report;
#pragma pack(pop)
accel_report accel_report;
/* start the performance counter */
perf_begin(_accel_sample_perf);
check_registers();
if (_register_wait != 0) {
// we are waiting for some good transfers before using
// the sensor again.
_register_wait--;
perf_end(_accel_sample_perf);
return;
}
/* fetch data from the sensor */
memset(&raw_accel_mag_report, 0, sizeof(raw_accel_mag_report));
raw_accel_mag_report.cmd[0] = DIR_READ(FXOS8700CQ_DR_STATUS);
raw_accel_mag_report.cmd[1] = ADDR_7(FXOS8700CQ_DR_STATUS);
transfer((uint8_t *)&raw_accel_mag_report, (uint8_t *)&raw_accel_mag_report, sizeof(raw_accel_mag_report));
if (!(raw_accel_mag_report.status & DR_STATUS_ZYXDR)) {
perf_end(_accel_sample_perf);
perf_count(_accel_duplicates);
return;
}
/*
* 1) Scale raw value to SI units using scaling from datasheet.
* 2) Subtract static offset (in SI units)
* 3) Scale the statically calibrated values with a linear
* dynamically obtained factor
*
* Note: the static sensor offset is the number the sensor outputs
* at a nominally 'zero' input. Therefore the offset has to
* be subtracted.
*
* Example: A gyro outputs a value of 74 at zero angular rate
* the offset is 74 from the origin and subtracting
* 74 from all measurements centers them around zero.
*/
accel_report.timestamp = hrt_absolute_time();
/*
* Eight-bit 2’s complement sensor temperature value with 0.96 °C/LSB sensitivity.
* Temperature data is only valid between –40 °C and 125 °C. The temperature sensor
* output is only valid when M_CTRL_REG1[m_hms] > 0b00. Please note that the
* temperature sensor is uncalibrated and its output for a given temperature will vary from
* one device to the next
*/
write_checked_reg(FXOS8700CQ_M_CTRL_REG1, M_CTRL_REG1_HMS_A | M_CTRL_REG1_OS(7));
_last_temperature = (read_reg(FXOS8700CQ_TEMP)) * 0.96f;
write_checked_reg(FXOS8700CQ_M_CTRL_REG1, M_CTRL_REG1_HMS_AM | M_CTRL_REG1_OS(7));
accel_report.temperature = _last_temperature;
// report the error count as the sum of the number of bad
// register reads and bad values. This allows the higher level
// code to decide if it should use this sensor based on
// whether it has had failures
accel_report.error_count = perf_event_count(_bad_registers) + perf_event_count(_bad_values);
accel_report.x_raw = swap16RightJustify14(raw_accel_mag_report.x);
accel_report.y_raw = swap16RightJustify14(raw_accel_mag_report.y);
accel_report.z_raw = swap16RightJustify14(raw_accel_mag_report.z);
/* Save off the Mag readings todo: revist integrating theses */
_last_raw_mag_x = swap16(raw_accel_mag_report.mx);
_last_raw_mag_y = swap16(raw_accel_mag_report.my);
_last_raw_mag_z = swap16(raw_accel_mag_report.mz);
float xraw_f = accel_report.x_raw;
float yraw_f = accel_report.y_raw;
float zraw_f = accel_report.z_raw;
// apply user specified rotation
rotate_3f(_rotation, xraw_f, yraw_f, zraw_f);
float x_in_new = ((xraw_f * _accel_range_scale) - _accel_scale.x_offset) * _accel_scale.x_scale;
float y_in_new = ((yraw_f * _accel_range_scale) - _accel_scale.y_offset) * _accel_scale.y_scale;
float z_in_new = ((zraw_f * _accel_range_scale) - _accel_scale.z_offset) * _accel_scale.z_scale;
/*
we have logs where the accelerometers get stuck at a fixed
large value. We want to detect this and mark the sensor as
being faulty
*/
if (fabsf(_last_accel[0] - x_in_new) < 0.001f &&
fabsf(_last_accel[1] - y_in_new) < 0.001f &&
fabsf(_last_accel[2] - z_in_new) < 0.001f &&
fabsf(x_in_new) > 20 &&
fabsf(y_in_new) > 20 &&
fabsf(z_in_new) > 20) {
_constant_accel_count += 1;
} else {
_constant_accel_count = 0;
}
if (_constant_accel_count > 100) {
// we've had 100 constant accel readings with large
// values. The sensor is almost certainly dead. We
// will raise the error_count so that the top level
// flight code will know to avoid this sensor, but
// we'll still give the data so that it can be logged
// and viewed
perf_count(_bad_values);
_constant_accel_count = 0;
}
_last_accel[0] = x_in_new;
_last_accel[1] = y_in_new;
_last_accel[2] = z_in_new;
accel_report.x = _accel_filter_x.apply(x_in_new);
accel_report.y = _accel_filter_y.apply(y_in_new);
accel_report.z = _accel_filter_z.apply(z_in_new);
math::Vector<3> aval(x_in_new, y_in_new, z_in_new);
math::Vector<3> aval_integrated;
bool accel_notify = _accel_int.put(accel_report.timestamp, aval, aval_integrated, accel_report.integral_dt);
accel_report.x_integral = aval_integrated(0);
accel_report.y_integral = aval_integrated(1);
accel_report.z_integral = aval_integrated(2);
accel_report.scaling = _accel_range_scale;
accel_report.range_m_s2 = _accel_range_m_s2;
/* return device ID */
accel_report.device_id = _device_id.devid;
_accel_reports->force(&accel_report);
/* notify anyone waiting for data */
if (accel_notify) {
poll_notify(POLLIN);
if (!(_pub_blocked)) {
/* publish it */
orb_publish(ORB_ID(sensor_accel), _accel_topic, &accel_report);
}
}
_accel_read++;
/* stop the perf counter */
perf_end(_accel_sample_perf);
}
void
L3GD20::measure()
{
/* status register and data as read back from the device */
#pragma pack(push, 1)
struct {
uint8_t cmd;
int8_t temp;
uint8_t status;
int16_t x;
int16_t y;
int16_t z;
} raw_report;
#pragma pack(pop)
gyro_report report;
/* start the performance counter */
perf_begin(_sample_perf);
check_registers();
/* fetch data from the sensor */
memset(&raw_report, 0, sizeof(raw_report));
raw_report.cmd = ADDR_OUT_TEMP | DIR_READ | ADDR_INCREMENT;
transfer((uint8_t *)&raw_report, (uint8_t *)&raw_report, sizeof(raw_report));
if (!(raw_report.status & STATUS_ZYXDA)) {
perf_end(_sample_perf);
perf_count(_duplicates);
return;
}
/*
* 1) Scale raw value to SI units using scaling from datasheet.
* 2) Subtract static offset (in SI units)
* 3) Scale the statically calibrated values with a linear
* dynamically obtained factor
*
* Note: the static sensor offset is the number the sensor outputs
* at a nominally 'zero' input. Therefore the offset has to
* be subtracted.
*
* Example: A gyro outputs a value of 74 at zero angular rate
* the offset is 74 from the origin and subtracting
* 74 from all measurements centers them around zero.
*/
report.timestamp = hrt_absolute_time();
report.error_count = perf_event_count(_bad_registers);
switch (_orientation) {
case SENSOR_BOARD_ROTATION_000_DEG:
/* keep axes in place */
report.x_raw = raw_report.x;
report.y_raw = raw_report.y;
break;
case SENSOR_BOARD_ROTATION_090_DEG:
/* swap x and y */
report.x_raw = raw_report.y;
report.y_raw = raw_report.x;
break;
case SENSOR_BOARD_ROTATION_180_DEG:
/* swap x and y and negate both */
report.x_raw = ((raw_report.x == -32768) ? 32767 : -raw_report.x);
report.y_raw = ((raw_report.y == -32768) ? 32767 : -raw_report.y);
break;
case SENSOR_BOARD_ROTATION_270_DEG:
/* swap x and y and negate y */
report.x_raw = raw_report.y;
report.y_raw = ((raw_report.x == -32768) ? 32767 : -raw_report.x);
break;
}
report.z_raw = raw_report.z;
#if defined(CONFIG_ARCH_BOARD_MINDPX_V2)
int16_t tx = -report.y_raw;
int16_t ty = -report.x_raw;
int16_t tz = -report.z_raw;
report.x_raw = tx;
report.y_raw = ty;
report.z_raw = tz;
#endif
report.temperature_raw = raw_report.temp;
float xraw_f = report.x_raw;
float yraw_f = report.y_raw;
float zraw_f = report.z_raw;
// apply user specified rotation
rotate_3f(_rotation, xraw_f, yraw_f, zraw_f);
float xin = ((xraw_f * _gyro_range_scale) - _gyro_scale.x_offset) * _gyro_scale.x_scale;
float yin = ((yraw_f * _gyro_range_scale) - _gyro_scale.y_offset) * _gyro_scale.y_scale;
float zin = ((zraw_f * _gyro_range_scale) - _gyro_scale.z_offset) * _gyro_scale.z_scale;
report.x = _gyro_filter_x.apply(xin);
report.y = _gyro_filter_y.apply(yin);
report.z = _gyro_filter_z.apply(zin);
math::Vector<3> gval(xin, yin, zin);
math::Vector<3> gval_integrated;
bool gyro_notify = _gyro_int.put(report.timestamp, gval, gval_integrated, report.integral_dt);
report.x_integral = gval_integrated(0);
report.y_integral = gval_integrated(1);
report.z_integral = gval_integrated(2);
report.temperature = L3GD20_TEMP_OFFSET_CELSIUS - raw_report.temp;
report.scaling = _gyro_range_scale;
report.range_rad_s = _gyro_range_rad_s;
_reports->force(&report);
if (gyro_notify) {
/* notify anyone waiting for data */
poll_notify(POLLIN);
/* publish for subscribers */
if (!(_pub_blocked)) {
/* publish it */
orb_publish(ORB_ID(sensor_gyro), _gyro_topic, &report);
}
}
_read++;
/* stop the perf counter */
perf_end(_sample_perf);
}
void
L3GD20::measure()
{
/* status register and data as read back from the device */
#pragma pack(push, 1)
struct {
uint8_t cmd;
uint8_t temp;
uint8_t status;
int16_t x;
int16_t y;
int16_t z;
} raw_report;
#pragma pack(pop)
gyro_report report;
/* start the performance counter */
perf_begin(_sample_perf);
/* fetch data from the sensor */
memset(&raw_report, 0, sizeof(raw_report));
raw_report.cmd = ADDR_OUT_TEMP | DIR_READ | ADDR_INCREMENT;
transfer((uint8_t *)&raw_report, (uint8_t *)&raw_report, sizeof(raw_report));
/*
* 1) Scale raw value to SI units using scaling from datasheet.
* 2) Subtract static offset (in SI units)
* 3) Scale the statically calibrated values with a linear
* dynamically obtained factor
*
* Note: the static sensor offset is the number the sensor outputs
* at a nominally 'zero' input. Therefore the offset has to
* be subtracted.
*
* Example: A gyro outputs a value of 74 at zero angular rate
* the offset is 74 from the origin and subtracting
* 74 from all measurements centers them around zero.
*/
report.timestamp = hrt_absolute_time();
report.error_count = 0; // not recorded
switch (_orientation) {
case SENSOR_BOARD_ROTATION_000_DEG:
/* keep axes in place */
report.x_raw = raw_report.x;
report.y_raw = raw_report.y;
break;
case SENSOR_BOARD_ROTATION_090_DEG:
/* swap x and y */
report.x_raw = raw_report.y;
report.y_raw = raw_report.x;
break;
case SENSOR_BOARD_ROTATION_180_DEG:
/* swap x and y and negate both */
report.x_raw = ((raw_report.x == -32768) ? 32767 : -raw_report.x);
report.y_raw = ((raw_report.y == -32768) ? 32767 : -raw_report.y);
break;
case SENSOR_BOARD_ROTATION_270_DEG:
/* swap x and y and negate y */
report.x_raw = raw_report.y;
report.y_raw = ((raw_report.x == -32768) ? 32767 : -raw_report.x);
break;
}
report.z_raw = raw_report.z;
report.x = ((report.x_raw * _gyro_range_scale) - _gyro_scale.x_offset) * _gyro_scale.x_scale;
report.y = ((report.y_raw * _gyro_range_scale) - _gyro_scale.y_offset) * _gyro_scale.y_scale;
report.z = ((report.z_raw * _gyro_range_scale) - _gyro_scale.z_offset) * _gyro_scale.z_scale;
report.x = _gyro_filter_x.apply(report.x);
report.y = _gyro_filter_y.apply(report.y);
report.z = _gyro_filter_z.apply(report.z);
report.scaling = _gyro_range_scale;
report.range_rad_s = _gyro_range_rad_s;
_reports->force(&report);
/* notify anyone waiting for data */
poll_notify(POLLIN);
/* publish for subscribers */
if (_gyro_topic > 0)
orb_publish(ORB_ID(sensor_gyro), _gyro_topic, &report);
_read++;
/* stop the perf counter */
perf_end(_sample_perf);
}
void AttitudeEstimatorQ::task_main()
{
_sensors_sub = orb_subscribe(ORB_ID(sensor_combined));
_vision_sub = orb_subscribe(ORB_ID(vision_position_estimate));
_mocap_sub = orb_subscribe(ORB_ID(att_pos_mocap));
_params_sub = orb_subscribe(ORB_ID(parameter_update));
_global_pos_sub = orb_subscribe(ORB_ID(vehicle_global_position));
update_parameters(true);
hrt_abstime last_time = 0;
px4_pollfd_struct_t fds[1];
fds[0].fd = _sensors_sub;
fds[0].events = POLLIN;
while (!_task_should_exit) {
int ret = px4_poll(fds, 1, 1000);
if (_mavlink_fd < 0) {
_mavlink_fd = open(MAVLINK_LOG_DEVICE, 0);
}
if (ret < 0) {
// Poll error, sleep and try again
usleep(10000);
continue;
} else if (ret == 0) {
// Poll timeout, do nothing
continue;
}
update_parameters(false);
// Update sensors
sensor_combined_s sensors;
if (!orb_copy(ORB_ID(sensor_combined), _sensors_sub, &sensors)) {
// Feed validator with recent sensor data
for (unsigned i = 0; i < (sizeof(sensors.gyro_timestamp) / sizeof(sensors.gyro_timestamp[0])); i++) {
/* ignore empty fields */
if (sensors.gyro_timestamp[i] > 0) {
float gyro[3];
for (unsigned j = 0; j < 3; j++) {
if (sensors.gyro_integral_dt[i] > 0) {
gyro[j] = (double)sensors.gyro_integral_rad[i * 3 + j] / (sensors.gyro_integral_dt[i] / 1e6);
} else {
/* fall back to angular rate */
gyro[j] = sensors.gyro_rad_s[i * 3 + j];
}
}
_voter_gyro.put(i, sensors.gyro_timestamp[i], &gyro[0], sensors.gyro_errcount[i], sensors.gyro_priority[i]);
}
_voter_accel.put(i, sensors.accelerometer_timestamp[i], &sensors.accelerometer_m_s2[i * 3],
sensors.accelerometer_errcount[i], sensors.accelerometer_priority[i]);
_voter_mag.put(i, sensors.magnetometer_timestamp[i], &sensors.magnetometer_ga[i * 3],
sensors.magnetometer_errcount[i], sensors.magnetometer_priority[i]);
}
int best_gyro, best_accel, best_mag;
// Get best measurement values
hrt_abstime curr_time = hrt_absolute_time();
_gyro.set(_voter_gyro.get_best(curr_time, &best_gyro));
_accel.set(_voter_accel.get_best(curr_time, &best_accel));
_mag.set(_voter_mag.get_best(curr_time, &best_mag));
if (_accel.length() < 0.01f || _mag.length() < 0.01f) {
warnx("WARNING: degenerate accel / mag!");
continue;
}
_data_good = true;
if (!_failsafe && (_voter_gyro.failover_count() > 0 ||
_voter_accel.failover_count() > 0 ||
_voter_mag.failover_count() > 0)) {
_failsafe = true;
mavlink_and_console_log_emergency(_mavlink_fd, "SENSOR FAILSAFE! RETURN TO LAND IMMEDIATELY");
}
if (!_vibration_warning && (_voter_gyro.get_vibration_factor(curr_time) > _vibration_warning_threshold ||
_voter_accel.get_vibration_factor(curr_time) > _vibration_warning_threshold ||
_voter_mag.get_vibration_factor(curr_time) > _vibration_warning_threshold)) {
if (_vibration_warning_timestamp == 0) {
_vibration_warning_timestamp = curr_time;
} else if (hrt_elapsed_time(&_vibration_warning_timestamp) > 10000000) {
_vibration_warning = true;
mavlink_and_console_log_critical(_mavlink_fd, "HIGH VIBRATION! g: %d a: %d m: %d",
(int)(100 * _voter_gyro.get_vibration_factor(curr_time)),
(int)(100 * _voter_accel.get_vibration_factor(curr_time)),
(int)(100 * _voter_mag.get_vibration_factor(curr_time)));
}
} else {
_vibration_warning_timestamp = 0;
}
}
// Update vision and motion capture heading
bool vision_updated = false;
orb_check(_vision_sub, &vision_updated);
bool mocap_updated = false;
orb_check(_mocap_sub, &mocap_updated);
if (vision_updated) {
orb_copy(ORB_ID(vision_position_estimate), _vision_sub, &_vision);
math::Quaternion q(_vision.q);
math::Matrix<3, 3> Rvis = q.to_dcm();
math::Vector<3> v(1.0f, 0.0f, 0.4f);
// Rvis is Rwr (robot respect to world) while v is respect to world.
// Hence Rvis must be transposed having (Rwr)' * Vw
// Rrw * Vw = vn. This way we have consistency
_vision_hdg = Rvis.transposed() * v;
}
if (mocap_updated) {
orb_copy(ORB_ID(att_pos_mocap), _mocap_sub, &_mocap);
math::Quaternion q(_mocap.q);
math::Matrix<3, 3> Rmoc = q.to_dcm();
math::Vector<3> v(1.0f, 0.0f, 0.4f);
// Rmoc is Rwr (robot respect to world) while v is respect to world.
// Hence Rmoc must be transposed having (Rwr)' * Vw
// Rrw * Vw = vn. This way we have consistency
_mocap_hdg = Rmoc.transposed() * v;
}
// Check for timeouts on data
if (_ext_hdg_mode == 1) {
_ext_hdg_good = _vision.timestamp_boot > 0 && (hrt_elapsed_time(&_vision.timestamp_boot) < 500000);
} else if (_ext_hdg_mode == 2) {
_ext_hdg_good = _mocap.timestamp_boot > 0 && (hrt_elapsed_time(&_mocap.timestamp_boot) < 500000);
}
bool gpos_updated;
orb_check(_global_pos_sub, &gpos_updated);
if (gpos_updated) {
orb_copy(ORB_ID(vehicle_global_position), _global_pos_sub, &_gpos);
if (_mag_decl_auto && _gpos.eph < 20.0f && hrt_elapsed_time(&_gpos.timestamp) < 1000000) {
/* set magnetic declination automatically */
_mag_decl = math::radians(get_mag_declination(_gpos.lat, _gpos.lon));
}
}
if (_acc_comp && _gpos.timestamp != 0 && hrt_absolute_time() < _gpos.timestamp + 20000 && _gpos.eph < 5.0f && _inited) {
/* position data is actual */
if (gpos_updated) {
Vector<3> vel(_gpos.vel_n, _gpos.vel_e, _gpos.vel_d);
/* velocity updated */
if (_vel_prev_t != 0 && _gpos.timestamp != _vel_prev_t) {
float vel_dt = (_gpos.timestamp - _vel_prev_t) / 1000000.0f;
/* calculate acceleration in body frame */
_pos_acc = _q.conjugate_inversed((vel - _vel_prev) / vel_dt);
}
_vel_prev_t = _gpos.timestamp;
_vel_prev = vel;
}
} else {
/* position data is outdated, reset acceleration */
_pos_acc.zero();
_vel_prev.zero();
_vel_prev_t = 0;
}
// Time from previous iteration
hrt_abstime now = hrt_absolute_time();
float dt = (last_time > 0) ? ((now - last_time) / 1000000.0f) : 0.00001f;
last_time = now;
if (dt > _dt_max) {
dt = _dt_max;
}
if (!update(dt)) {
continue;
}
Vector<3> euler = _q.to_euler();
struct vehicle_attitude_s att = {};
att.timestamp = sensors.timestamp;
att.roll = euler(0);
att.pitch = euler(1);
att.yaw = euler(2);
/* the complimentary filter should reflect the true system
* state, but we need smoother outputs for the control system
*/
att.rollspeed = _lp_roll_rate.apply(_rates(0));
att.pitchspeed = _lp_pitch_rate.apply(_rates(1));
att.yawspeed = _lp_yaw_rate.apply(_rates(2));
for (int i = 0; i < 3; i++) {
att.g_comp[i] = _accel(i) - _pos_acc(i);
}
/* copy offsets */
memcpy(&att.rate_offsets, _gyro_bias.data, sizeof(att.rate_offsets));
Matrix<3, 3> R = _q.to_dcm();
/* copy rotation matrix */
memcpy(&att.R[0], R.data, sizeof(att.R));
att.R_valid = true;
att.rate_vibration = _voter_gyro.get_vibration_factor(hrt_absolute_time());
att.accel_vibration = _voter_accel.get_vibration_factor(hrt_absolute_time());
att.mag_vibration = _voter_mag.get_vibration_factor(hrt_absolute_time());
if (_att_pub == nullptr) {
_att_pub = orb_advertise(ORB_ID(vehicle_attitude), &att);
} else {
orb_publish(ORB_ID(vehicle_attitude), _att_pub, &att);
}
struct control_state_s ctrl_state = {};
ctrl_state.timestamp = sensors.timestamp;
/* Attitude quaternions for control state */
ctrl_state.q[0] = _q(0);
ctrl_state.q[1] = _q(1);
ctrl_state.q[2] = _q(2);
ctrl_state.q[3] = _q(3);
/* Attitude rates for control state */
ctrl_state.roll_rate = _lp_roll_rate.apply(_rates(0));
ctrl_state.pitch_rate = _lp_pitch_rate.apply(_rates(1));
ctrl_state.yaw_rate = _rates(2);
/* Publish to control state topic */
if (_ctrl_state_pub == nullptr) {
_ctrl_state_pub = orb_advertise(ORB_ID(control_state), &ctrl_state);
} else {
orb_publish(ORB_ID(control_state), _ctrl_state_pub, &ctrl_state);
}
}
}
int
FXAS21002C::ioctl(struct file *filp, int cmd, unsigned long arg)
{
switch (cmd) {
case SENSORIOCSPOLLRATE: {
switch (arg) {
/* switching to manual polling */
case SENSOR_POLLRATE_MANUAL:
stop();
_call_interval = 0;
return OK;
/* external signalling not supported */
case SENSOR_POLLRATE_EXTERNAL:
/* zero would be bad */
case 0:
return -EINVAL;
/* set default/max polling rate */
case SENSOR_POLLRATE_MAX:
case SENSOR_POLLRATE_DEFAULT:
return ioctl(filp, SENSORIOCSPOLLRATE, FXAS21002C_DEFAULT_RATE);
/* adjust to a legal polling interval in Hz */
default: {
/* do we need to start internal polling? */
bool want_start = (_call_interval == 0);
/* convert hz to hrt interval via microseconds */
unsigned ticks = 1000000 / arg;
/* check against maximum sane rate */
if (ticks < 1000) {
return -EINVAL;
}
/* update interval for next measurement */
/* XXX this is a bit shady, but no other way to adjust... */
_call_interval = ticks;
_gyro_call.period = _call_interval - FXAS21002C_TIMER_REDUCTION;
/* adjust filters */
float cutoff_freq_hz = _gyro_filter_x.get_cutoff_freq();
float sample_rate = 1.0e6f / ticks;
set_sw_lowpass_filter(sample_rate, cutoff_freq_hz);
/* if we need to start the poll state machine, do it */
if (want_start) {
start();
}
return OK;
}
}
}
case SENSORIOCGPOLLRATE:
if (_call_interval == 0) {
return SENSOR_POLLRATE_MANUAL;
}
return 1000000 / _call_interval;
case SENSORIOCSQUEUEDEPTH: {
/* lower bound is mandatory, upper bound is a sanity check */
if ((arg < 1) || (arg > 100)) {
return -EINVAL;
}
irqstate_t flags = px4_enter_critical_section();
if (!_reports->resize(arg)) {
px4_leave_critical_section(flags);
return -ENOMEM;
}
px4_leave_critical_section(flags);
return OK;
}
case SENSORIOCRESET:
reset();
return OK;
case GYROIOCSSAMPLERATE:
return set_samplerate(arg);
case GYROIOCGSAMPLERATE:
return _current_rate;
case GYROIOCSSCALE:
/* copy scale in */
memcpy(&_gyro_scale, (struct gyro_calibration_s *) arg, sizeof(_gyro_scale));
return OK;
case GYROIOCGSCALE:
/* copy scale out */
memcpy((struct gyro_calibration_s *) arg, &_gyro_scale, sizeof(_gyro_scale));
return OK;
case GYROIOCSRANGE:
/* arg should be in dps */
return set_range(arg);
case GYROIOCGRANGE:
/* convert to dps and round */
return (unsigned long)(_gyro_range_rad_s * 180.0f / M_PI_F + 0.5f);
default:
/* give it to the superclass */
return SPI::ioctl(filp, cmd, arg);
}
}
void Ekf2::task_main()
{
// subscribe to relevant topics
_sensors_sub = orb_subscribe(ORB_ID(sensor_combined));
_gps_sub = orb_subscribe(ORB_ID(vehicle_gps_position));
_airspeed_sub = orb_subscribe(ORB_ID(airspeed));
_params_sub = orb_subscribe(ORB_ID(parameter_update));
_control_mode_sub = orb_subscribe(ORB_ID(vehicle_control_mode));
_vehicle_status_sub = orb_subscribe(ORB_ID(vehicle_status));
px4_pollfd_struct_t fds[2] = {};
fds[0].fd = _sensors_sub;
fds[0].events = POLLIN;
fds[1].fd = _params_sub;
fds[1].events = POLLIN;
// initialise parameter cache
updateParams();
vehicle_gps_position_s gps = {};
while (!_task_should_exit) {
int ret = px4_poll(fds, sizeof(fds) / sizeof(fds[0]), 1000);
if (ret < 0) {
// Poll error, sleep and try again
usleep(10000);
continue;
} else if (ret == 0) {
// Poll timeout or no new data, do nothing
continue;
}
if (fds[1].revents & POLLIN) {
// read from param to clear updated flag
struct parameter_update_s update;
orb_copy(ORB_ID(parameter_update), _params_sub, &update);
updateParams();
// fetch sensor data in next loop
continue;
} else if (!(fds[0].revents & POLLIN)) {
// no new data
continue;
}
bool gps_updated = false;
bool airspeed_updated = false;
bool control_mode_updated = false;
bool vehicle_status_updated = false;
sensor_combined_s sensors = {};
airspeed_s airspeed = {};
vehicle_control_mode_s vehicle_control_mode = {};
orb_copy(ORB_ID(sensor_combined), _sensors_sub, &sensors);
// update all other topics if they have new data
orb_check(_gps_sub, &gps_updated);
if (gps_updated) {
orb_copy(ORB_ID(vehicle_gps_position), _gps_sub, &gps);
}
orb_check(_airspeed_sub, &airspeed_updated);
if (airspeed_updated) {
orb_copy(ORB_ID(airspeed), _airspeed_sub, &airspeed);
}
// Use the control model data to determine if the motors are armed as a surrogate for an on-ground vs in-air status
// TODO implement a global vehicle on-ground/in-air check
orb_check(_control_mode_sub, &control_mode_updated);
if (control_mode_updated) {
orb_copy(ORB_ID(vehicle_control_mode), _control_mode_sub, &vehicle_control_mode);
_ekf->set_arm_status(vehicle_control_mode.flag_armed);
}
hrt_abstime now = hrt_absolute_time();
// push imu data into estimator
_ekf->setIMUData(now, sensors.gyro_integral_dt[0], sensors.accelerometer_integral_dt[0],
&sensors.gyro_integral_rad[0], &sensors.accelerometer_integral_m_s[0]);
// read mag data
_ekf->setMagData(sensors.magnetometer_timestamp[0], &sensors.magnetometer_ga[0]);
// read baro data
_ekf->setBaroData(sensors.baro_timestamp[0], &sensors.baro_alt_meter[0]);
// read gps data if available
if (gps_updated) {
struct gps_message gps_msg = {};
gps_msg.time_usec = gps.timestamp_position;
gps_msg.lat = gps.lat;
gps_msg.lon = gps.lon;
gps_msg.alt = gps.alt;
gps_msg.fix_type = gps.fix_type;
gps_msg.eph = gps.eph;
gps_msg.epv = gps.epv;
gps_msg.sacc = gps.s_variance_m_s;
gps_msg.time_usec_vel = gps.timestamp_velocity;
gps_msg.vel_m_s = gps.vel_m_s;
gps_msg.vel_ned[0] = gps.vel_n_m_s;
gps_msg.vel_ned[1] = gps.vel_e_m_s;
gps_msg.vel_ned[2] = gps.vel_d_m_s;
gps_msg.vel_ned_valid = gps.vel_ned_valid;
gps_msg.nsats = gps.satellites_used;
//TODO add gdop to gps topic
gps_msg.gdop = 0.0f;
_ekf->setGpsData(gps.timestamp_position, &gps_msg);
}
// read airspeed data if available
if (airspeed_updated) {
_ekf->setAirspeedData(airspeed.timestamp, &airspeed.indicated_airspeed_m_s);
}
// read vehicle status if available for 'landed' information
orb_check(_vehicle_status_sub, &vehicle_status_updated);
if (vehicle_status_updated) {
struct vehicle_status_s status = {};
orb_copy(ORB_ID(vehicle_status), _vehicle_status_sub, &status);
_ekf->set_in_air_status(!status.condition_landed);
}
// run the EKF update
_ekf->update();
// generate vehicle attitude data
struct vehicle_attitude_s att = {};
att.timestamp = hrt_absolute_time();
_ekf->copy_quaternion(att.q);
matrix::Quaternion<float> q(att.q[0], att.q[1], att.q[2], att.q[3]);
matrix::Euler<float> euler(q);
att.roll = euler(0);
att.pitch = euler(1);
att.yaw = euler(2);
// generate vehicle local position data
struct vehicle_local_position_s lpos = {};
float pos[3] = {};
float vel[3] = {};
lpos.timestamp = hrt_absolute_time();
// Position in local NED frame
_ekf->copy_position(pos);
lpos.x = pos[0];
lpos.y = pos[1];
lpos.z = pos[2];
// Velocity in NED frame (m/s)
_ekf->copy_velocity(vel);
lpos.vx = vel[0];
lpos.vy = vel[1];
lpos.vz = vel[2];
// TODO: better status reporting
lpos.xy_valid = _ekf->position_is_valid();
lpos.z_valid = true;
lpos.v_xy_valid = _ekf->position_is_valid();
lpos.v_z_valid = true;
// Position of local NED origin in GPS / WGS84 frame
struct map_projection_reference_s ekf_origin = {};
_ekf->get_ekf_origin(&lpos.ref_timestamp, &ekf_origin, &lpos.ref_alt);
lpos.xy_global =
_ekf->position_is_valid(); // true if position (x, y) is valid and has valid global reference (ref_lat, ref_lon)
lpos.z_global = true; // true if z is valid and has valid global reference (ref_alt)
lpos.ref_lat = ekf_origin.lat_rad * 180.0 / M_PI; // Reference point latitude in degrees
lpos.ref_lon = ekf_origin.lon_rad * 180.0 / M_PI; // Reference point longitude in degrees
// The rotation of the tangent plane vs. geographical north
lpos.yaw = 0.0f;
lpos.dist_bottom = 0.0f; // Distance to bottom surface (ground) in meters
lpos.dist_bottom_rate = 0.0f; // Distance to bottom surface (ground) change rate
lpos.surface_bottom_timestamp = 0; // Time when new bottom surface found
lpos.dist_bottom_valid = false; // true if distance to bottom surface is valid
// TODO: uORB definition does not define what thes variables are. We have assumed them to be horizontal and vertical 1-std dev accuracy in metres
// TODO: Should use sqrt of filter position variances
lpos.eph = gps.eph;
lpos.epv = gps.epv;
// publish vehicle local position data
if (_lpos_pub == nullptr) {
_lpos_pub = orb_advertise(ORB_ID(vehicle_local_position), &lpos);
} else {
orb_publish(ORB_ID(vehicle_local_position), _lpos_pub, &lpos);
}
// generate control state data
control_state_s ctrl_state = {};
ctrl_state.timestamp = hrt_absolute_time();
ctrl_state.roll_rate = _lp_roll_rate.apply(sensors.gyro_rad_s[0]);
ctrl_state.pitch_rate = _lp_pitch_rate.apply(sensors.gyro_rad_s[1]);
ctrl_state.yaw_rate = _lp_yaw_rate.apply(sensors.gyro_rad_s[2]);
ctrl_state.q[0] = q(0);
ctrl_state.q[1] = q(1);
ctrl_state.q[2] = q(2);
ctrl_state.q[3] = q(3);
// publish control state data
if (_control_state_pub == nullptr) {
_control_state_pub = orb_advertise(ORB_ID(control_state), &ctrl_state);
} else {
orb_publish(ORB_ID(control_state), _control_state_pub, &ctrl_state);
}
// generate vehicle attitude data
att.q[0] = q(0);
att.q[1] = q(1);
att.q[2] = q(2);
att.q[3] = q(3);
att.q_valid = true;
att.rollspeed = sensors.gyro_rad_s[0];
att.pitchspeed = sensors.gyro_rad_s[1];
att.yawspeed = sensors.gyro_rad_s[2];
// publish vehicle attitude data
if (_att_pub == nullptr) {
_att_pub = orb_advertise(ORB_ID(vehicle_attitude), &att);
} else {
orb_publish(ORB_ID(vehicle_attitude), _att_pub, &att);
}
// generate and publish global position data
struct vehicle_global_position_s global_pos = {};
if (_ekf->position_is_valid()) {
// TODO: local origin is currenlty at GPS height origin - this is different to ekf_att_pos_estimator
global_pos.timestamp = hrt_absolute_time(); // Time of this estimate, in microseconds since system start
global_pos.time_utc_usec = gps.time_utc_usec; // GPS UTC timestamp in microseconds
double est_lat, est_lon;
map_projection_reproject(&ekf_origin, lpos.x, lpos.y, &est_lat, &est_lon);
global_pos.lat = est_lat; // Latitude in degrees
global_pos.lon = est_lon; // Longitude in degrees
global_pos.alt = -pos[2] + lpos.ref_alt; // Altitude AMSL in meters
global_pos.vel_n = vel[0]; // Ground north velocity, m/s
global_pos.vel_e = vel[1]; // Ground east velocity, m/s
global_pos.vel_d = vel[2]; // Ground downside velocity, m/s
global_pos.yaw = euler(2); // Yaw in radians -PI..+PI.
global_pos.eph = gps.eph; // Standard deviation of position estimate horizontally
global_pos.epv = gps.epv; // Standard deviation of position vertically
// TODO: implement terrain estimator
global_pos.terrain_alt = 0.0f; // Terrain altitude in m, WGS84
global_pos.terrain_alt_valid = false; // Terrain altitude estimate is valid
// TODO use innovatun consistency check timouts to set this
global_pos.dead_reckoning = false; // True if this position is estimated through dead-reckoning
global_pos.pressure_alt = sensors.baro_alt_meter[0]; // Pressure altitude AMSL (m)
if (_vehicle_global_position_pub == nullptr) {
_vehicle_global_position_pub = orb_advertise(ORB_ID(vehicle_global_position), &global_pos);
} else {
orb_publish(ORB_ID(vehicle_global_position), _vehicle_global_position_pub, &global_pos);
}
}
// publish estimator status
struct estimator_status_s status = {};
status.timestamp = hrt_absolute_time();
_ekf->get_state_delayed(status.states);
_ekf->get_covariances(status.covariances);
//status.gps_check_fail_flags = _ekf->_gps_check_fail_status.value;
if (_estimator_status_pub == nullptr) {
_estimator_status_pub = orb_advertise(ORB_ID(estimator_status), &status);
} else {
orb_publish(ORB_ID(estimator_status), _estimator_status_pub, &status);
}
// publish estimator innovation data
struct ekf2_innovations_s innovations = {};
innovations.timestamp = hrt_absolute_time();
_ekf->get_vel_pos_innov(&innovations.vel_pos_innov[0]);
_ekf->get_mag_innov(&innovations.mag_innov[0]);
_ekf->get_heading_innov(&innovations.heading_innov);
_ekf->get_vel_pos_innov_var(&innovations.vel_pos_innov_var[0]);
_ekf->get_mag_innov_var(&innovations.mag_innov_var[0]);
_ekf->get_heading_innov_var(&innovations.heading_innov_var);
if (_estimator_innovations_pub == nullptr) {
_estimator_innovations_pub = orb_advertise(ORB_ID(ekf2_innovations), &innovations);
} else {
orb_publish(ORB_ID(ekf2_innovations), _estimator_innovations_pub, &innovations);
}
// save the declination to the EKF2_MAG_DECL parameter when a dis-arm event is detected
if ((_params->mag_declination_source & (1 << 1)) && _prev_motors_armed && !vehicle_control_mode.flag_armed) {
float decl_deg;
_ekf->copy_mag_decl_deg(&decl_deg);
_mag_declination_deg->set(decl_deg);
}
_prev_motors_armed = vehicle_control_mode.flag_armed;
}
delete ekf2::instance;
ekf2::instance = nullptr;
}
void AttitudeEstimatorQ::task_main()
{
#ifdef __PX4_POSIX
perf_counter_t _perf_accel(perf_alloc_once(PC_ELAPSED, "sim_accel_delay"));
perf_counter_t _perf_mpu(perf_alloc_once(PC_ELAPSED, "sim_mpu_delay"));
perf_counter_t _perf_mag(perf_alloc_once(PC_ELAPSED, "sim_mag_delay"));
#endif
_sensors_sub = orb_subscribe(ORB_ID(sensor_combined));
_vision_sub = orb_subscribe(ORB_ID(vision_position_estimate));
_mocap_sub = orb_subscribe(ORB_ID(att_pos_mocap));
_airspeed_sub = orb_subscribe(ORB_ID(airspeed));
_params_sub = orb_subscribe(ORB_ID(parameter_update));
_global_pos_sub = orb_subscribe(ORB_ID(vehicle_global_position));
update_parameters(true);
hrt_abstime last_time = 0;
px4_pollfd_struct_t fds[1] = {};
fds[0].fd = _sensors_sub;
fds[0].events = POLLIN;
while (!_task_should_exit) {
int ret = px4_poll(fds, 1, 1000);
if (ret < 0) {
// Poll error, sleep and try again
usleep(10000);
PX4_WARN("Q POLL ERROR");
continue;
} else if (ret == 0) {
// Poll timeout, do nothing
PX4_WARN("Q POLL TIMEOUT");
continue;
}
update_parameters(false);
// Update sensors
sensor_combined_s sensors;
if (!orb_copy(ORB_ID(sensor_combined), _sensors_sub, &sensors)) {
// Feed validator with recent sensor data
if (sensors.timestamp > 0) {
// Filter gyro signal since it is not fildered in the drivers.
_gyro(0) = _lp_gyro_x.apply(sensors.gyro_rad[0]);
_gyro(1) = _lp_gyro_y.apply(sensors.gyro_rad[1]);
_gyro(2) = _lp_gyro_z.apply(sensors.gyro_rad[2]);
}
if (sensors.accelerometer_timestamp_relative != sensor_combined_s::RELATIVE_TIMESTAMP_INVALID) {
// Filter accel signal since it is not fildered in the drivers.
_accel(0) = _lp_accel_x.apply(sensors.accelerometer_m_s2[0]);
_accel(1) = _lp_accel_y.apply(sensors.accelerometer_m_s2[1]);
_accel(2) = _lp_accel_z.apply(sensors.accelerometer_m_s2[2]);
if (_accel.length() < 0.01f) {
PX4_DEBUG("WARNING: degenerate accel!");
continue;
}
}
if (sensors.magnetometer_timestamp_relative != sensor_combined_s::RELATIVE_TIMESTAMP_INVALID) {
_mag(0) = sensors.magnetometer_ga[0];
_mag(1) = sensors.magnetometer_ga[1];
_mag(2) = sensors.magnetometer_ga[2];
if (_mag.length() < 0.01f) {
PX4_DEBUG("WARNING: degenerate mag!");
continue;
}
}
_data_good = true;
}
// Update vision and motion capture heading
bool vision_updated = false;
orb_check(_vision_sub, &vision_updated);
bool mocap_updated = false;
orb_check(_mocap_sub, &mocap_updated);
if (vision_updated) {
orb_copy(ORB_ID(vision_position_estimate), _vision_sub, &_vision);
math::Quaternion q(_vision.q);
math::Matrix<3, 3> Rvis = q.to_dcm();
math::Vector<3> v(1.0f, 0.0f, 0.4f);
// Rvis is Rwr (robot respect to world) while v is respect to world.
// Hence Rvis must be transposed having (Rwr)' * Vw
// Rrw * Vw = vn. This way we have consistency
_vision_hdg = Rvis.transposed() * v;
}
if (mocap_updated) {
orb_copy(ORB_ID(att_pos_mocap), _mocap_sub, &_mocap);
math::Quaternion q(_mocap.q);
math::Matrix<3, 3> Rmoc = q.to_dcm();
math::Vector<3> v(1.0f, 0.0f, 0.4f);
// Rmoc is Rwr (robot respect to world) while v is respect to world.
// Hence Rmoc must be transposed having (Rwr)' * Vw
// Rrw * Vw = vn. This way we have consistency
_mocap_hdg = Rmoc.transposed() * v;
}
// Update airspeed
bool airspeed_updated = false;
orb_check(_airspeed_sub, &airspeed_updated);
if (airspeed_updated) {
orb_copy(ORB_ID(airspeed), _airspeed_sub, &_airspeed);
}
// Check for timeouts on data
if (_ext_hdg_mode == 1) {
_ext_hdg_good = _vision.timestamp > 0 && (hrt_elapsed_time(&_vision.timestamp) < 500000);
} else if (_ext_hdg_mode == 2) {
_ext_hdg_good = _mocap.timestamp > 0 && (hrt_elapsed_time(&_mocap.timestamp) < 500000);
}
bool gpos_updated;
orb_check(_global_pos_sub, &gpos_updated);
if (gpos_updated) {
orb_copy(ORB_ID(vehicle_global_position), _global_pos_sub, &_gpos);
if (_mag_decl_auto && _gpos.eph < 20.0f && hrt_elapsed_time(&_gpos.timestamp) < 1000000) {
/* set magnetic declination automatically */
update_mag_declination(math::radians(get_mag_declination(_gpos.lat, _gpos.lon)));
}
}
if (_acc_comp && _gpos.timestamp != 0 && hrt_absolute_time() < _gpos.timestamp + 20000 && _gpos.eph < 5.0f && _inited) {
/* position data is actual */
if (gpos_updated) {
Vector<3> vel(_gpos.vel_n, _gpos.vel_e, _gpos.vel_d);
/* velocity updated */
if (_vel_prev_t != 0 && _gpos.timestamp != _vel_prev_t) {
float vel_dt = (_gpos.timestamp - _vel_prev_t) / 1000000.0f;
/* calculate acceleration in body frame */
_pos_acc = _q.conjugate_inversed((vel - _vel_prev) / vel_dt);
}
_vel_prev_t = _gpos.timestamp;
_vel_prev = vel;
}
} else {
/* position data is outdated, reset acceleration */
_pos_acc.zero();
_vel_prev.zero();
_vel_prev_t = 0;
}
/* time from previous iteration */
hrt_abstime now = hrt_absolute_time();
float dt = (last_time > 0) ? ((now - last_time) / 1000000.0f) : 0.00001f;
last_time = now;
if (dt > _dt_max) {
dt = _dt_max;
}
if (!update(dt)) {
continue;
}
Vector<3> euler = _q.to_euler();
struct vehicle_attitude_s att = {};
att.timestamp = sensors.timestamp;
att.rollspeed = _rates(0);
att.pitchspeed = _rates(1);
att.yawspeed = _rates(2);
memcpy(&att.q[0], _q.data, sizeof(att.q));
/* the instance count is not used here */
int att_inst;
orb_publish_auto(ORB_ID(vehicle_attitude), &_att_pub, &att, &att_inst, ORB_PRIO_HIGH);
{
struct control_state_s ctrl_state = {};
ctrl_state.timestamp = sensors.timestamp;
/* attitude quaternions for control state */
ctrl_state.q[0] = _q(0);
ctrl_state.q[1] = _q(1);
ctrl_state.q[2] = _q(2);
ctrl_state.q[3] = _q(3);
ctrl_state.x_acc = _accel(0);
ctrl_state.y_acc = _accel(1);
ctrl_state.z_acc = _accel(2);
/* attitude rates for control state */
ctrl_state.roll_rate = _rates(0);
ctrl_state.pitch_rate = _rates(1);
ctrl_state.yaw_rate = _rates(2);
ctrl_state.airspeed_valid = false;
if (_airspeed_mode == control_state_s::AIRSPD_MODE_MEAS) {
// use measured airspeed
if (PX4_ISFINITE(_airspeed.indicated_airspeed_m_s) && hrt_absolute_time() - _airspeed.timestamp < 1e6
&& _airspeed.timestamp > 0) {
ctrl_state.airspeed = _airspeed.indicated_airspeed_m_s;
ctrl_state.airspeed_valid = true;
}
}
else if (_airspeed_mode == control_state_s::AIRSPD_MODE_EST) {
// use estimated body velocity as airspeed estimate
if (hrt_absolute_time() - _gpos.timestamp < 1e6) {
ctrl_state.airspeed = sqrtf(_gpos.vel_n * _gpos.vel_n + _gpos.vel_e * _gpos.vel_e + _gpos.vel_d * _gpos.vel_d);
ctrl_state.airspeed_valid = true;
}
} else if (_airspeed_mode == control_state_s::AIRSPD_MODE_DISABLED) {
// do nothing, airspeed has been declared as non-valid above, controllers
// will handle this assuming always trim airspeed
}
/* the instance count is not used here */
int ctrl_inst;
/* publish to control state topic */
orb_publish_auto(ORB_ID(control_state), &_ctrl_state_pub, &ctrl_state, &ctrl_inst, ORB_PRIO_HIGH);
}
{
//struct estimator_status_s est = {};
//est.timestamp = sensors.timestamp;
/* the instance count is not used here */
//int est_inst;
/* publish to control state topic */
// TODO handle attitude states in position estimators instead so we can publish all data at once
// or we need to enable more thatn just one estimator_status topic
// orb_publish_auto(ORB_ID(estimator_status), &_est_state_pub, &est, &est_inst, ORB_PRIO_HIGH);
}
}
#ifdef __PX4_POSIX
perf_end(_perf_accel);
perf_end(_perf_mpu);
perf_end(_perf_mag);
#endif
orb_unsubscribe(_sensors_sub);
orb_unsubscribe(_vision_sub);
orb_unsubscribe(_mocap_sub);
orb_unsubscribe(_airspeed_sub);
orb_unsubscribe(_params_sub);
orb_unsubscribe(_global_pos_sub);
}
void
FXAS21002C::measure()
{
/* status register and data as read back from the device */
#pragma pack(push, 1)
struct {
uint8_t cmd;
uint8_t status;
int16_t x;
int16_t y;
int16_t z;
} raw_gyro_report;
#pragma pack(pop)
struct gyro_report gyro_report;
/* start the performance counter */
perf_begin(_sample_perf);
check_registers();
if (_register_wait != 0) {
// we are waiting for some good transfers before using
// the sensor again.
_register_wait--;
perf_end(_sample_perf);
return;
}
/* fetch data from the sensor */
memset(&raw_gyro_report, 0, sizeof(raw_gyro_report));
raw_gyro_report.cmd = DIR_READ(FXAS21002C_STATUS);
transfer((uint8_t *)&raw_gyro_report, (uint8_t *)&raw_gyro_report, sizeof(raw_gyro_report));
if (!(raw_gyro_report.status & DR_STATUS_ZYXDR)) {
perf_end(_sample_perf);
perf_count(_duplicates);
return;
}
/*
* The TEMP register contains an 8-bit 2's complement temperature value with a range
* of –128 °C to +127 °C and a scaling of 1 °C/LSB. The temperature data is only
* compensated (factory trim values applied) when the device is operating in the Active
* mode and actively measuring the angular rate.
*/
if ((_read % _current_rate) == 0) {
_last_temperature = read_reg(FXAS21002C_TEMP) * 1.0f;
gyro_report.temperature = _last_temperature;
}
/*
* 1) Scale raw value to SI units using scaling from datasheet.
* 2) Subtract static offset (in SI units)
* 3) Scale the statically calibrated values with a linear
* dynamically obtained factor
*
* Note: the static sensor offset is the number the sensor outputs
* at a nominally 'zero' input. Therefore the offset has to
* be subtracted.
*
* Example: A gyro outputs a value of 74 at zero angular rate
* the offset is 74 from the origin and subtracting
* 74 from all measurements centers them around zero.
*/
gyro_report.timestamp = hrt_absolute_time();
// report the error count as the number of bad
// register reads. This allows the higher level
// code to decide if it should use this sensor based on
// whether it has had failures
gyro_report.error_count = perf_event_count(_bad_registers);
gyro_report.x_raw = swap16(raw_gyro_report.x);
gyro_report.y_raw = swap16(raw_gyro_report.y);
gyro_report.z_raw = swap16(raw_gyro_report.z);
float xraw_f = gyro_report.x_raw;
float yraw_f = gyro_report.y_raw;
float zraw_f = gyro_report.z_raw;
// apply user specified rotation
rotate_3f(_rotation, xraw_f, yraw_f, zraw_f);
float x_in_new = ((xraw_f * _gyro_range_scale) - _gyro_scale.x_offset) * _gyro_scale.x_scale;
float y_in_new = ((yraw_f * _gyro_range_scale) - _gyro_scale.y_offset) * _gyro_scale.y_scale;
float z_in_new = ((zraw_f * _gyro_range_scale) - _gyro_scale.z_offset) * _gyro_scale.z_scale;
gyro_report.x = _gyro_filter_x.apply(x_in_new);
gyro_report.y = _gyro_filter_y.apply(y_in_new);
gyro_report.z = _gyro_filter_z.apply(z_in_new);
matrix::Vector3f gval(x_in_new, y_in_new, z_in_new);
matrix::Vector3f gval_integrated;
bool gyro_notify = _gyro_int.put(gyro_report.timestamp, gval, gval_integrated, gyro_report.integral_dt);
gyro_report.x_integral = gval_integrated(0);
gyro_report.y_integral = gval_integrated(1);
gyro_report.z_integral = gval_integrated(2);
gyro_report.scaling = _gyro_range_scale;
/* return device ID */
gyro_report.device_id = _device_id.devid;
_reports->force(&gyro_report);
/* notify anyone waiting for data */
if (gyro_notify) {
poll_notify(POLLIN);
if (!(_pub_blocked)) {
/* publish it */
orb_publish(ORB_ID(sensor_gyro), _gyro_topic, &gyro_report);
}
}
_read++;
/* stop the perf counter */
perf_end(_sample_perf);
}
void
LSM303D::measure()
{
// if the accel doesn't have any data ready then re-schedule
// for 100 microseconds later. This ensures we don't double
// read a value and then miss the next value
if (stm32_gpioread(GPIO_EXTI_ACCEL_DRDY) == 0) {
perf_count(_accel_reschedules);
hrt_call_delay(&_accel_call, 100);
return;
}
if (read_reg(ADDR_CTRL_REG1) != _reg1_expected) {
perf_count(_reg1_resets);
reset();
return;
}
/* status register and data as read back from the device */
#pragma pack(push, 1)
struct {
uint8_t cmd;
uint8_t status;
int16_t x;
int16_t y;
int16_t z;
} raw_accel_report;
#pragma pack(pop)
accel_report accel_report;
/* start the performance counter */
perf_begin(_accel_sample_perf);
/* fetch data from the sensor */
memset(&raw_accel_report, 0, sizeof(raw_accel_report));
raw_accel_report.cmd = ADDR_STATUS_A | DIR_READ | ADDR_INCREMENT;
transfer((uint8_t *)&raw_accel_report, (uint8_t *)&raw_accel_report, sizeof(raw_accel_report));
/*
* 1) Scale raw value to SI units using scaling from datasheet.
* 2) Subtract static offset (in SI units)
* 3) Scale the statically calibrated values with a linear
* dynamically obtained factor
*
* Note: the static sensor offset is the number the sensor outputs
* at a nominally 'zero' input. Therefore the offset has to
* be subtracted.
*
* Example: A gyro outputs a value of 74 at zero angular rate
* the offset is 74 from the origin and subtracting
* 74 from all measurements centers them around zero.
*/
accel_report.timestamp = hrt_absolute_time();
accel_report.error_count = 0; // not reported
accel_report.x_raw = raw_accel_report.x;
accel_report.y_raw = raw_accel_report.y;
accel_report.z_raw = raw_accel_report.z;
float x_in_new = ((accel_report.x_raw * _accel_range_scale) - _accel_scale.x_offset) * _accel_scale.x_scale;
float y_in_new = ((accel_report.y_raw * _accel_range_scale) - _accel_scale.y_offset) * _accel_scale.y_scale;
float z_in_new = ((accel_report.z_raw * _accel_range_scale) - _accel_scale.z_offset) * _accel_scale.z_scale;
accel_report.x = _accel_filter_x.apply(x_in_new);
accel_report.y = _accel_filter_y.apply(y_in_new);
accel_report.z = _accel_filter_z.apply(z_in_new);
accel_report.scaling = _accel_range_scale;
accel_report.range_m_s2 = _accel_range_m_s2;
_accel_reports->force(&accel_report);
/* notify anyone waiting for data */
poll_notify(POLLIN);
if (_accel_topic > 0 && !(_pub_blocked)) {
/* publish it */
orb_publish(ORB_ID(sensor_accel), _accel_topic, &accel_report);
}
_accel_read++;
/* stop the perf counter */
perf_end(_accel_sample_perf);
}
void
L3GD20::measure()
{
#if L3GD20_USE_DRDY
// if the gyro doesn't have any data ready then re-schedule
// for 100 microseconds later. This ensures we don't double
// read a value and then miss the next value
if (_bus == PX4_SPI_BUS_SENSORS && stm32_gpioread(GPIO_EXTI_GYRO_DRDY) == 0) {
perf_count(_reschedules);
hrt_call_delay(&_call, 100);
return;
}
#endif
/* status register and data as read back from the device */
#pragma pack(push, 1)
struct {
uint8_t cmd;
uint8_t temp;
uint8_t status;
int16_t x;
int16_t y;
int16_t z;
} raw_report;
#pragma pack(pop)
gyro_report report;
/* start the performance counter */
perf_begin(_sample_perf);
/* fetch data from the sensor */
memset(&raw_report, 0, sizeof(raw_report));
raw_report.cmd = ADDR_OUT_TEMP | DIR_READ | ADDR_INCREMENT;
transfer((uint8_t *)&raw_report, (uint8_t *)&raw_report, sizeof(raw_report));
#if L3GD20_USE_DRDY
if ((raw_report.status & 0xF) != 0xF) {
/*
we waited for DRDY, but did not see DRDY on all axes
when we captured. That means a transfer error of some sort
*/
perf_count(_errors);
return;
}
#endif
/*
* 1) Scale raw value to SI units using scaling from datasheet.
* 2) Subtract static offset (in SI units)
* 3) Scale the statically calibrated values with a linear
* dynamically obtained factor
*
* Note: the static sensor offset is the number the sensor outputs
* at a nominally 'zero' input. Therefore the offset has to
* be subtracted.
*
* Example: A gyro outputs a value of 74 at zero angular rate
* the offset is 74 from the origin and subtracting
* 74 from all measurements centers them around zero.
*/
report.timestamp = hrt_absolute_time();
report.error_count = 0; // not recorded
switch (_orientation) {
case SENSOR_BOARD_ROTATION_000_DEG:
/* keep axes in place */
report.x_raw = raw_report.x;
report.y_raw = raw_report.y;
break;
case SENSOR_BOARD_ROTATION_090_DEG:
/* swap x and y */
report.x_raw = raw_report.y;
report.y_raw = raw_report.x;
break;
case SENSOR_BOARD_ROTATION_180_DEG:
/* swap x and y and negate both */
report.x_raw = ((raw_report.x == -32768) ? 32767 : -raw_report.x);
report.y_raw = ((raw_report.y == -32768) ? 32767 : -raw_report.y);
break;
case SENSOR_BOARD_ROTATION_270_DEG:
/* swap x and y and negate y */
report.x_raw = raw_report.y;
report.y_raw = ((raw_report.x == -32768) ? 32767 : -raw_report.x);
break;
}
report.z_raw = raw_report.z;
report.x = ((report.x_raw * _gyro_range_scale) - _gyro_scale.x_offset) * _gyro_scale.x_scale;
report.y = ((report.y_raw * _gyro_range_scale) - _gyro_scale.y_offset) * _gyro_scale.y_scale;
report.z = ((report.z_raw * _gyro_range_scale) - _gyro_scale.z_offset) * _gyro_scale.z_scale;
report.x = _gyro_filter_x.apply(report.x);
report.y = _gyro_filter_y.apply(report.y);
report.z = _gyro_filter_z.apply(report.z);
// apply user specified rotation
rotate_3f(_rotation, report.x, report.y, report.z);
report.scaling = _gyro_range_scale;
report.range_rad_s = _gyro_range_rad_s;
_reports->force(&report);
/* notify anyone waiting for data */
poll_notify(POLLIN);
/* publish for subscribers */
if (!(_pub_blocked)) {
/* publish it */
orb_publish(_orb_id, _gyro_topic, &report);
}
_read++;
/* stop the perf counter */
perf_end(_sample_perf);
}
int
MEASAirspeed::collect()
{
int ret = -EIO;
/* read from the sensor */
uint8_t val[4] = {0, 0, 0, 0};
perf_begin(_sample_perf);
ret = transfer(nullptr, 0, &val[0], 4);
if (ret < 0) {
perf_count(_comms_errors);
perf_end(_sample_perf);
return ret;
}
uint8_t status = (val[0] & 0xC0) >> 6;
switch (status) {
case 0:
// Normal Operation. Good Data Packet
break;
case 1:
// Reserved
return -EAGAIN;
case 2:
// Stale Data. Data has been fetched since last measurement cycle.
return -EAGAIN;
case 3:
// Fault Detected
perf_count(_comms_errors);
perf_end(_sample_perf);
return -EAGAIN;
}
int16_t dp_raw = 0, dT_raw = 0;
dp_raw = (val[0] << 8) + val[1];
/* mask the used bits */
dp_raw = 0x3FFF & dp_raw;
dT_raw = (val[2] << 8) + val[3];
dT_raw = (0xFFE0 & dT_raw) >> 5;
// dT max is almost certainly an invalid reading
if (dT_raw == 2047) {
perf_count(_comms_errors);
return -EAGAIN;
}
float temperature = ((200.0f * dT_raw) / 2047) - 50;
// Calculate differential pressure. As its centered around 8000
// and can go positive or negative
const float P_min = -1.0f;
const float P_max = 1.0f;
const float PSI_to_Pa = 6894.757f;
/*
this equation is an inversion of the equation in the
pressure transfer function figure on page 4 of the datasheet
We negate the result so that positive differential pressures
are generated when the bottom port is used as the static
port on the pitot and top port is used as the dynamic port
*/
float diff_press_PSI = -((dp_raw - 0.1f * 16383) * (P_max - P_min) / (0.8f * 16383) + P_min);
float diff_press_pa_raw = diff_press_PSI * PSI_to_Pa;
// correct for 5V rail voltage if possible
voltage_correction(diff_press_pa_raw, temperature);
/*
With the above calculation the MS4525 sensor will produce a
positive number when the top port is used as a dynamic port
and bottom port is used as the static port
*/
struct differential_pressure_s report;
report.timestamp = hrt_absolute_time();
report.error_count = perf_event_count(_comms_errors);
report.temperature = temperature;
report.differential_pressure_filtered_pa = _filter.apply(diff_press_pa_raw) - _diff_pres_offset;
report.differential_pressure_raw_pa = diff_press_pa_raw - _diff_pres_offset;
report.device_id = _device_id.devid;
if (_airspeed_pub != nullptr && !(_pub_blocked)) {
/* publish it */
orb_publish(ORB_ID(differential_pressure), _airspeed_pub, &report);
}
ret = OK;
perf_end(_sample_perf);
return ret;
}